In drylands there is a noticeable lack of trees. This situation is kind of a Catch-22. The hotter and drier it is, the less water there is in the ground to provide for plants that can attain height, and the more the leaves of the existing trees must adapt (become smaller) to prevent transpiration and sunburn. Yet the very lack of trees and their extensive root systems, and the shade and habitat they create, and the transpiration that allows humidity to keep the air moist for pollen to survive, is one of the causes of desertification.
So how do we stop this cycle?
First, work on a manageable area. If you have a large property, then start on the area closest to your home or where you need water the most, or where water settles. As in the Annie Lamont title, Bird by Bird, you work on a piece a little at a time.
- Put in earthworks to harvest rainwater. Simple swales or rain catchment basins, perpendicular to the water flow and on contour with your property, will harvest hundreds of gallons of water each rain. You can do them with tractors, you can do them with shovels, you can do small ones with trowels above small plants. Just do them.
- Bury organic matter: hugelkultur. Do you have old wood laying around? Palm trees that are growing and being a fire hazard? Old untreated lumber full of nails? Branches? All of this can be layered into the ground. Bury organic matter downhill from your swales. If you cannot bury, then pound sticks vertically into the ground. The important thing is that you are adding organic material back into your depleted soil. It will hold rainwater, it will activate soil microbes and fungi, it will open oxygen and nutrient channels, it will sequester carbon and make it available to the plants. Our soil is mostly just dead dirt. By layering organic material with dirt you are doing what nature does, but at an accelerated pace. If your soil is unmanageable, or you can’t dig, then layer on top of the soil. Its called, among other things, lasagne gardening. Lay out newspaper, top it with fresh grass clippings or other greens, top that with dried grass clippings, dried leaves or other ‘brown’ materials, and depending upon what you want to plant in this, you can top it with mulch or with a layer of good compost and then mulch. Then plant in it! You create soil on top of the ground.
- Mulch and sheet mulch! Protect your soil from the heat and wind, and from pounding rain. A thin layer of bark will actually heat up and accelerate the evaporation process: add several inches of mulch to the ground. Better yet, sheet mulch by laying cardboard and/or newspaper directly on top of the weeds and layering an inch or more of mulch on top. This can be free mulch from landscapers, old weeds, grass clippings, animal bedding, softwood cuttings… just cover the soil to keep it moist and protected. Thick mulching alone will help keep some humidity in the air and begin soil processes, as well as reduce evaporation by reflected heat that comes from bare earth or gravel.
- Plant native plants. They thrive in our soil. Grow trees that filter the sun and don’t like a lot of water, such as palo verde, or those that take minimal additional water such as desert willow, California redbud, valley oak, or others. Grow tall bushes such as toyon, lemonadeberry, sugarbush, quailbush, ceanothusor others. Use these wonderful plants to invite in birds,butterflies, lizards and other wildlife that will begin pollination and help activate the soil.
- Design your garden for what you want to grow besides natives. Fruit trees? Vegetables? Ornamentals? They can be arranged in your mulched area in guilds to grow cooperatively.
- Grow shade. Fast-growing trees and shrubs are invaluable for protecting – ‘nurserying in’ – less hardy plants. Acacia and cassia are both nitrogen-fixers and will grow quickly to shade your plants, can be cut for green waste in the fall and also attract pollinators. Moringa is completely edible and is also an excellent chop-and-drop tree. There are many others. You need to protect what you plant from the harsh summer sunlight, and using sacrificial trees and shrubs is the most productive way to do it.
- Protect your tree trunks from scorching by growing light vines up them, such as beans or small squash.
Once you have done this process in one area, then move on to the next, like a patchwork quilt. These areas should all be planted in accordance with a larger plan that covers your entire property, so that you plant what you want in the best possible place. However, the earthworks, hugelkultur and mulching can be done everywhere. By following these guidelines, and working one small area at a time, you’ll have success, have trees, shade, food and be helping reverse desertification, one plot at a time.
In February, 2011, I signed the contract with Roger Boddaert to create a permaculture food forest. The goals at that time were to stop the erosion on the property, to create a wildlife habitat, and to grow food, medicine, native plants, building materials, herbs and ornamentals in a sane way: no chemicals. So the journey began, and it hasn’t been easy. Nor did I at that time know that the garden would evolve into Finch Frolic Garden and my business would be education.
In preparing for a talk about our garden, Miranda and I worked on before and after photos. The garden this April, 2017, is stunning, with blooming wisteria, fruit trees, red bud, roses, angel-wing jasmine, iris, and so much more. Best of all Mrs. Mallard has brought her annual flock of ducklings from wherever she nests, and the four babies are still alive and thriving after a week! So I thought I’d share the incredible difference between what had been, and what is now. All done with low water use, no fertilizer, herbicide, insecticide, additives or supplements. Come visit when you can! Slideshow images change in ten seconds:
Last Saturday we hosted our first workshop of 2017, featuring Alden Hough of Sky Mountain Permaculture. Alden is a master at creating earthworks, and he spent three hours here at Finch Frolic Garden teaching a class of sixteen people how to install swales correctly. The project was a small pond that overflowed and flooded when heavy rains hit. The soil is heavy clay and therefore the small pond doesn’t percolate. It is kept filled by the well, and its overflow feeds the bog and the big pond. Right now the little pond is full of native Pacific chorus frog tadpoles, which will evolve into small frogs that will go out into the landscape and eat bugs the rest of the year. He created a urbanite (cement chunks) spillway into a twenty-foot swale. The class learned what a bunyip was and how to use the water level, and how to use a laser level. The swale will hold about 300 gallons of water that would have overflowed into another area, spread and sink the water.
The swale was measured and marked on contour. Bermuda grass was pulled from it and set into trash cans to cook in the sun and hopefully be destroyed. The swale was then dug by hand. Old wood – branches, logs, boards and old posts – were laid below the swale, and covered by the dirt. This hugelkultur will absorb seeping water, aerate and enrich the soil, and provide food and water over time for the trees downhill.More dirt was needed to cover the wood so we emptied the first rain catchment basin on the property of silt and hauled it down the hill. This was a lot of heavy work, and several of our attendees worked extremely hard with the wheelbarrows. Miranda and I have a lot of experience doing this heavy work, and we are glad that this swale project also emptied this basin.
Our wonderful workshop attendees worked very hard in the heat. The end result was a swale of beauty. By creating level swales dug on contour, you can see how right it looks. It hasn’t been dug deeper into the ground at one end to force the swale to be level. If you measure on contour your swale can be of any size, and it will collect, passify, spread and sink rainwater into the landscape. Earthworks are the best way to hold water, and are imperative to reestablishing water tables, keeping wells running, keeping trees alive and maintaining springs and streams. A little earthworks will make a huge difference.
What needs to be done now is to create a dedicated overflow from the swale into the main pond. As this area receives a lot of foot traffic, we’ll also need to haul more silt to make the raised walkway more gradual and blended with the paths around. Once the tadpoles have grown and left the pond, we can drain it and use that silt. Two projects in one.
Prior to the project Miranda carefully removed a lot of healthy creeping red fescue from the work site. After the swale and spillway were dug she replanted some of it. Native yarrow will also be planted to help hold the swale.
A huge thanks to the many people who came to learn and work on site. No matter how many movies you watch or books you read, having hands-on experience makes the education click. And an extra huge thanks to Alden Hough for his expertise and hard work. Please visit Sky Mountain Permaculture in Escondido for more classes – earth bag dome building included – coming up there.
Our next Finch Frolic Garden workshop will be in April: April 22, 2pm – 4pm: The Many Benefits of Trees: Care, Nurturing and Pruning . Roger Boddaert, the Tree Man of Fallbrook and professional landscaper who planned the original garden that would evolve into Finch Frolic Garden, will talk about trees. So many trees are dying due to the drought, and we need to replace them to help shade and cool the earth and hold onto moisture. But what to plant, where and how to care for them? Roger will take you through tree care based on fifty years of experience in landscaping. Visit https://www.southernpalmetto.com/services/ and get all the details.
Go forth and dig swales!
Happy March! Finch Frolic Garden is officially open, and the trees are bursting into leaf and bloom. Birds are twitterpating and the ten inches of rain we’ve received since October are slowly working through the soil thanks to our earthworks.
Here’s an opportunity to learn just how to create accurate swales and hugelkultur so that they work. Saturday March 11th from 1 -4 we have the privilege of having Alden Hough from Sky Mountain Permaculture hold our first monthly workshop here in the garden. Alden has years of experience with building earthworks on all scales, from guiding excavators across hillsides to hand-dug. Alden will describe how to build swales and hugelkultur beds, show off equipment, and then its hands-on in the garden. You’ll learn how to use a laser level and a bunyip, and get the feel of how to build on contour. Bring your gloves and be prepared to have some fun creating earthworks, so that you can do it properly on your own property.
The workshop fee is $20/person. Please RSVP to email@example.com. Wear appropriate work clothes and sun protection. Complimentary vegetarian refreshments will be available. Attendees may stroll Finch Frolic Garden as well. Don’t wait!
This week here in Fallbrook, CA, at Finch Frolic Garden we received almost three inches of rain in 18 hours. Our storm pattern is changing so that there are fewer rain events, but when it rains, it really rains. For many this was a flood. Precious rainwater is channeled away from properties and into the street. In permaculture gardens the water is harvested in the earth with simple earthworks such as swales (level-bottomed ditches) and rain catchment basins.
Visitors have often expressed their desire to see the earthworks in action, so I took my camera out into the food forest. That was when the rain gauge was at about two and three quarters, with more to come. (I wanted to photograph the garden after the storm had passed but my camera refused to turn on due to the indignity of having been wet. A couple of nights in a bag of rice did it wonders.)
Please excuse the unsteady camerawork, and my oilskin sleeve and dripping hand making cameo appearances in the film. I was using my hand to shield the lens from the rain.
Even if we don’t receive a lot of rain in drylands, we might have fog, sprinkles and other degrees of ambient moisture. This moisture can burn off with reflected heat from hard-packed earth, from gravel and hardscape, and from buildings. It is too irregular and thin to make the use of mist nets feasible. However, a much better way to collect that moisture and turn it into rain is the method nature uses: trees. The layers of a plant guild are designed to capture, soften and sink rainwater, so why not just let them do it? Many trees are dying due to heat, low water table, lack of rainfall and dry air. Replacing them with native and drought-tolerant trees is essential to help put the brakes on desertification.
Please take five minutes, follow this link and listen and have a walk with me into Finch Frolic Garden as this 5-year-old canopy collects moisture and turns it into rain:
Plant a tree!
Before you start buying pipe, make your design. If you are new to the property, evaluate the plants and features that exist and decide if you really want them or not. Use the ‘three positives’ rule in permaculture: everything in your yard should give you at least three positive things. For instance, you have a eucalyptus tree. It gives great shade, it is a great roost for larger birds which keep down your mice and rats, it drops lots of leaves for mulch, etc. On the ‘negative’ side, they are really thirsty and they send their roots out in search of water. They will go to the nearest irrigation and drink from there, robbing water from the tree you are trying to water. They are also allelopathic, meaning that they produce a substance that discourages many other plants from growing, or growing successfully, under or near them. Their root mass is so thick close to the surface that very few plants can survive. If planted in the wrong spot they will block views, hang over the house, drop those leaves, peels of bark and depending upon the species, heavy branches, where you don’t want them, get into overhead wires or underground leach lines, etc. They don’t make good firewood or building material, and are highly flammable. How does the tree weigh in? Usually eucalyptus are all negatives in my book. Only if they are providing the only shade and bird perches for a property are they useful. Even then I recommend pollarding them (reducing their height) and trying to ‘nursery in’ other better trees to take their place. Cut trees then should be buried, as in hugelkultur. So evaluate what you have using the three positives rule and don’t be too sentimental if you don’t like something. Do you like them? If not, cut them and bury them to fertilize plants that will serve you, and yes, aesthetics is very much a plus. If you love a particular plant, then if its possible, plant it.
If you have a property that is a blank slate, your irrigation diagram will follow your plant design. If you have an existing landscape, as I had, you need to map out where all the trees and groupings of plants are, what their water needs are and keep in mind the way water runs past these plants when you do. Use Google Maps. Type in your address, find your home and zero in on it until you can clearly see the boundries of your property.
At the lower right Google shows you a key for distance. There is a line with a number above it. This shows you how many feet are represented by that length. Don’t assume that the line is one inch! The line will adjust, so put a ruler up to the screen and measure it. I zoom out until the line is an inch long, and take that number; its just easier to compute distances using an inch rather than a fraction. You can print that diagram of your property line, which will show you which way your house sits on the property.
I have a PC, so I press the PrntScr (print screen) key, paste it onto a paint.net screen, crop off the extra bits and print that. Now you have something to work with. I double or triple the size of the drawing onto a larger sheet; this can be done easily with a ruler, using the printed sheet to guide your angles.
Make a couple of copies of this template, and then use one to start drawing.
When you have the plants down on paper, then start with the irrigation. Determine where your water main is, and where any valves and hose bibs are around your house. If you only have domestic water to choose from, you’ll be coming from a domestic line.
Fifteen to twenty sprayers are good per valve. I’m not talking about high-pressure nozzles that shoot water all over the place; these you want to eliminate. Most of that water is evaporated.
The sprinklers that we installed have a spray of up to 4 feet, and can be reduced down to a drizzle.
These are what we installed here:
The 3/4″ T was glued in facing sideways rather than straight up. A black Street 90 and a white Street 90 were screwed into the T, firmly but with enough leeway to turn if pushed. Black ones don’t need pipe tape because they are soft and self-seal. The risers (nipples) are 6″, and were taped at both ends before screwing into the Street 90. (You don’t put the heads on yet because you’ll want to ‘blow’ out your system with water to clean the pipes beforehand. )
With this configuration the risers are resistant to damage from being kicked, from having 100-lb. tortoises crawling over them, etc.
They can be moved in all directions so that you can deliver water closer to small rooted new plants, then move them away as the root ball grows. If you have the assembly ready when you glue in the T, then you won’t have to struggle to screw it on. Ends will have a slip/thread elbow glued sideways with the same assembly.
There are lots of sprinkler heads out there. These sprayers have threaded ends rather than barbed, so that they stay in place rather than be blown off. These are 360 degree sprayers; you can obtain threaded sprayers for 180 and 90 degree, and probably other configurations as well.
Don’t forget the filter. A filter in every head saves you a lot of grief with plugged heads and poor irrigation down the line. They are easy to clean.
Next post: Concluding the project.
If you have an existing irrigation system that works, you may easily convert it by adapting the heads for whatever you want to plant. Many lawn conversions I’ve designed utilize the existing spray system, particularly for natives, but with a different watering schedule. Don’t spend money when you don’t have to.
If you have an old grove that is to be converted and downsized, you’ll usually have far more pressure in your system than you need for smaller heads which may cause them to blow. Working with an irrigation specialist for the valves and pressure is advisable. For this re-irrigation project of Finch Frolic Garden, I found Vista-based John Taylor of Taylor-Made Irrigation and Landscape, 760-945-0118. He’s the first person to listen to and consider what I have to say, based on my experience with the old system, and he adapts to different situations. I’ve learned some cool new things that I will pass on to you, and he’s enjoying learning permaculture techniques, which will help both him and his landscape clients.
Here’s a little world-weary advice from someone who trusts too easily: Many professionals no matter what their field have one set way of doing things that they apply to every situation, be it irrigation, plant selection, tree trimming, construction, etc. (My neighbor has his poor coral tree topped every year. Topping trees is a bad practice. When I asked him about it, he said that his tree trimmer has been topping trees for years and recommends it, so he’s talking his expert advice! Do you see the problem here?) You, I’m sure, have dealt with these people too. Every situation needs a different solution, so look for someone who is flexible, listens to you, can offer several solutions with various price ranges, and who will give you a detailed estimate up front. Jobs will always run over, but they shouldn’t run too much over and the professional should be determined to keep on budget, and honest with you when there is an overrun. If you ask a professional to do extra things, the new tasks will need to be added on to the original contract because it will take up part of the time allocated towards the original project, so the project completion date will be moved ahead, and will add on to the total cost. On the other side, if your professional adds on projects that he thinks you’ll like, and you give him the verbal okay, realize that he’ll be working on those projects in addition to the original tasks, so it will take longer and cost more than the original contract. Look for people who don’t consider telling you their life story part of the time for which you are paying. If you tell them your life story, remember that they are on the clock and you are paying for that time. (I’d rather deal with a quiet, focused professional than a chatterbox who will talk more than work. If he’s not talking to you, he’s probably on his phone a lot while on the job.) Look for neat vehicles with organization, letterhead for estimates and invoices, someone who shows up on time when they say they will, and stays until they are done. They should schedule in their lunch; if they work through it they are not going to work well for you later in the day, and its unprofessional. Its okay for professionals to handle several clients at one time, but only if they are well organized and are eager to finish your project on your timeline. Contractors are infamous for tearing something apart the first day, then disappearing for days or longer holding you hostage while they work on other projects. Its okay to ask about all of this, and really important to read reviews. Don’t always rely on people your friends have recommended; I’ve had both really bad and really good referrals, so make up your own mind.
Back to irrigation. Most irrigation is PVC, the white plastic pipe. If you have old buried metal pipes they should be examined for leaks. Mostly they will fail to function due to mineral buildup due to our hard water. The inner diameter of the pipe closes; if you’ve ever cleaned your shower head or seen house drains with the thick white inner coating, that’s what I’m talking about. It will slowly dissolve in vinegar, but the vinegar must remain in the pipe to soak it for awhile, then blown out an open riser to get rid of the chunks. All sprinkler heads must be decalcified as well. Often the buildup is so old that the pipes are deteriorating and just need to be replaced, usually with PVC. The galvanized pipe can either be left in the soil to gradually rot, which is fine, or else be dug up and sold for scrap. The labor cost involved with digging it up will probably be more than what you’ll get for scrap.
Here’s some understanding of water. The reason why domestic (potable) water is chlorinated is not to purify the water. That has already been done before it gets into the delivery pipes. It is to keep biomass from forming inside the water pipes. Biomass is any type of growth that forms, usually in wet conditions. Think of algae inside a fish tank or on the inside of a pool. Biomass is nature’s way of filtering and softening hard surfaces, and in nature is essential. In man-made pipes, the biomass can not only harbor things that can make humans sick, but also slows the flow of water. Garden hoses have some biomass inside of them, and any rough part will slow the water pressure. Lengths of any kind of pipe are the same. The longer the pipe, the slightly less pressure you’ll have. Pressure is important because you want your sprinkler heads to spray, not just dribble (unless you set them for dribbling). Pressure regulators are set in sprinkler heads, Netafim, and valves to keep lines from blowing out under normal pressure. If you don’t have an irrigation system set up for a large grove or large grasslands for animals, which require enough pressure to shoot water great distances, then you shouldn’t worry about the lines blowing out. But understanding about pressure and the effects of biomass and distance will determine what size pipe you lay.
Most people use domestic water for irrigation. Some rural areas have agricultural water available for commercial growers. Some people have well water, which is what I have. Well water has not been treated, so whatever has leached into that water is what you are delivering to the topsoil. Have your well water tested for contaminants and salts. You should have a filter after the pump on your well. However, our heavy-mineralized water will form a oozy barrier around the diaphragms in valves. If debris or too much of this slick mineral buildup accumulates, the valve won’t ‘seat’, or seal, and will allow some water to seep through the pipes even when the valve is off. This has been a huge problem here at FFG, and one which several irrigation ‘specialists’ have completely denied. They deal with treated water rather than well water, and just don’t understand. Some valves have diaphragms that can be very carefully cleaned and replaced, but not frequently before they are damaged. If you have a well, check with an irrigation specialist who has real-time experience with well water and valves to recommend the appropriate valves and filter system for you. I’ll talk more about the ones John recommended for FFG in a later post.
Large-diameter pipes will carry lots more water more slowly. Small-diameter pipes carry less water more quickly. If you lay out large diameter pipes from your valves, let’s say 1″ pipe like we’re using at FFG, then you can reduce the size of your pipe gradually to your sprinkler heads and that will be the best of both worlds. You will have volume of water and increased pressure. So John has recommended that we use 1″ PVC from our valves, which are connected to the well with 1″ PVC already.
Then we reduce the pipe to 3/4″ at the nearest T, or closest to the first sprinkler head.
Then the sprinklers are reduced down to 1/2″. Since our well is at the bottom of our slope and water needs to be pumped back to the top, this design really helps keep the topmost systems pressurized.
So as you are laying out your garden and irrigation system, understand about slope, water pressure, volume of water and your water source. These factors all have large parts to play in the long-term success of your irrigation.
Next time I’ll discuss drawing up an irrigation plan.
A previous draft of this post was about 2,000 words of mostly rant against Netafim, so I’m starting over trying to be more helpful. You’re welcome.
In Southern California, and many dryland areas, if you are to grow food crops you have to irrigate. I have met several people who believe that they can ‘dry farm’ crops such as grapes here, and that is problematic. Even in Central California where they receive many inches more rain than we do, farmers struggle in the long hot, dry summers.
There are many ways to water, and I’ll address as many as I can.
The first and most important step for irrigating your property is installing the earthworks that will harvest what rain we do receive and allow it to percolate into the soil. Paring that with burying wood and other organic material to hold that water, planting in shallow depressions rather than on raised mounds and sheet mulching will greatly increase the health of your plants and decrease your water bill.
For delivering captured or purchased water you’ll need some kind of tubing and a force to deliver the water. We’ll discuss the natural methods first:
For small yards, or for orchards with lots of labor, burying ollas (porous clay pots) in the center of a planting area is a wonderful idea. There is a really good article with diagrams and suggestions here. You can manually fill the ollas by carrying water to them (the best would be from rain barrels), or dragging a hose around to fill them. Or they can be combined with a water delivery system of pipes as discussed below. Water is then drawn through the porous pots by the dry soil around them, and thus to plant roots. There is a tutorial about making inexpensive ollas from small clay pots, and interesting comments, here. There are problems, but then, there are problems with everything. Clay pots can break, especially if you have soil that freezes or foot traffic. A larger pot doesn’t mean that water will be delivered farther underground; absorption is based on soil density. This is a system that you need to monitor and replace periodically. On the plus side, clay is natural and will decompose in the soil. Many years ago, long before I ‘discovered’ permaculture, I buried gallon milk jugs in which I punched small holes by some trees beyond any irrigation pipes. I didn’t know about ollas then; I just thought it was a good idea to get water close to the roots of the plants. This really worked and those trees are mature and still exist almost thirty years later, and still don’t have irrigation to them. However, I found that the plastic milk jugs become brittle and break apart, as will plastic soda bottles, and you really don’t want to bury plastic. Clay is much better.
Next would be delivering water via some kind of pipe. Clay pipes are the most natural, but unless you have the clay, the labor and the time to create lots of long, hollow clay pipes, this is a pricey option. Clay pipes break easily, too.
If you have lots of bamboo you can season it, split it, remove the nodes (partitions) and then mount it to deliver water to individual plants, to ollas, or to swales. Again, you need time, bamboo, labor and some expertise. There is a good article about it here.
There are a lot of plastic pipes out there, and although I hate to invest in more plastic, it is often a necessary evil. Drip irrigation comes in many forms. There are bendable tubes that ooze, tubes that have holes spaced usually 12″ or 24″, tubes that can be punctured and into which spray heads are inserted, and tubes which can support spaghetti strands that are staked out next to individual plants. The popularity of drip irrigation has been huge in water-saving communities. Unfortunately they have lots of problems. Here I’ll indulge in just a little rant, but only as an illustration.
One of the big problems with flexible tubing in arid areas is the high mineral content of the water and what it does to these tubes. Any holes -including those in small spray heads- will become clogged with minerals.
Flushing the system with vinegar works for a short time, but eventually the minerals win. If the tubing is buried, then it is virtually impossible to discover the blocked holes until plants begin to die. Tubing above ground becomes scorched in the sun and breaks down.
Also, flexible tubing is extremely chewy and fun with a little drink treat as a reward.
This is the opinion of gophers (who will chew them up below ground and you won’t know unless you find a flood or… you guessed it… dying plants), coyotes (who will dig the lines up even if there is an easier water source, because tubing is fun in the mouth), rats (because they are rats), and many other creatures. Eventually a buried flexible system will be overgrown by plant roots, will kink, will clog, will nick (and some products such as Netafim seem to nick if you even wave a trowel near it), and will be chewed. Some plants will be flooded; others will dry up. You will have an unending treasure hunt of finding buried tubing and trying to fix it, or sticking a knife point into the emitter holes to open them up and then having too much water spray out.
Plus, drip irrigation is not good for most landscape plants. Most woody perennials love a good deep drink down by their roots, and then let go dry for a varying time depending upon the species, weather and soil type. Most native California plants hate drip irrigation. According to Greg Rubin, co-author along with Lucy Warren of The California Native Landscape (Timber Press; March 5, 2013) and a San Diego native landscaper, native plants here enjoy an overhead spray such as what a rain storm would deliver. Some natives such as Flannel Bush (Fremontia) die with summer irrigation and are especially intolerant of drip. Drip is most appropriate with annuals or perennials that have very small root bases and that require regular watering. Small root balls are closer to the hot surface and will dry up more quickly. Vegetables, most herbs and bedding plants can use drip. Plants that have fuzzy leaves that can easily catch an air-born fungal disease such as powdery mildew are better watered close to the ground rather than with an overhead spray of chlorinated water.
Then there is PVC, the hard, barely flexible pipe that is ubiquitous in landscaping for decades. PVC is hard to chew, can be buried or left on the surface if covered with mulch (to protect from UV rays), is available in a UV protected version if you want to spend the extra money and still give it some sun protection, utilizes risers with larger diameter water deliver systems such as spray heads, bubblers, and even drip conversion emitters that have multiple black spaghetti strands emerging from them like some odd spider.
At Finch Frolic Garden I had taken advice to install Netafim, a brown flexible tubing with perforations set 12″ apart, which was buried across the property from each valve box. It has been a living nightmare for most of that time. Besides all the reasons that it could fail (it did all of them) listed above, it also at its best delivered the same amount of water to all of the plants no matter what their water needs. It was looped around most trees so that the trees would receive more water, but since then roots have engulfed the tubing, cutting off the water flow. There are areas with mysterious flooding where we can’t trace the source without killing many mature plants.
Over the past year we’ve lost about 1/4 of our plants including most of our vegetables, because we plant where there should be water, and then mysteriously, there isn’t any. Flushing with vinegar helped a little, but whatever holes are still functioning are closing up with mineral deposits. Okay, I’m ranting too much here. But this was an expensive investment, and an investment in plastic, that has stressed me and my garden. So upon weighing all my alternatives I’ve decided to install above-ground PVC with heads on risers that either spray or dribble, and the dribblers will go into fishscale swales above plants.
In the next few posts in this series I will talk about how to draw up an irrigation plan, installation, valves and other watering options, as Miranda and I spend our very hot summer days crawling through rose bushes and around trees gluing, cutting, blowing out and adjusting irrigation. Thanks for letting me vent.
This year should have been dubbed The Year of the Gopher. Every year brings an increase (and decrease) in some element in nature. There are big earwig years, painted bug years, cabbage moth years, just as there seem to be good and bad years for certain crops. This year seems to be a big one for gophers.
Pocket gophers are native to Southern California, and have their special roles to play in the landscape. They aerate, their tunnels are homes to lots of other animals and insects such as Pacific Chorus frogs, toads and lizards. They are food for snakes, raptors and even greater egrets. Their tunnels allow rainwater to penetrate the soil. And, like any of us, if offered really tasty specialty food they’ll go for it.
Gopher tunnels are prime real estate. As explained in a past post, it takes a considerable amount of energy for gophers to dig tunnels, and if you kill them, new gophers reoccupy the tunnels from surrounding property. They are territorial and so the young are always looking for opportunities to have their own tunnel system.
Methods we’ve been using to train our gophers have been challenged this year by the desperation of our gophers, caused no doubt by the changing weather and growth patterns. In our kitchen garden we’ve lost a lot of veggies this spring.
We don’t trap and kill here, so we work with animals because this is their home and habitat. Permaculture isn’t about taking over an area to the loss of everything that usually lives there, its about working with nature and learning from it. So the reason our kitchen garden has been attacked is that we didn’t prepare well enough to live with the gophers. The only way to keep plants safe is to have boundaries around root balls. Trees we plant in gopher cages, but vegetables -not so much.
So Miranda and I decided to bury 24″ tall 1/4″ wire around the garden.
These tasks always sound so easy! Trenching through clay in the heat of early summer has been a challenge. Gopher tunnels dug for food collection are within the first 18″ of dirt, and their nests are down to about 24″.
We pulled back sheet mulch on the pathways and found incredible fungal activity, loads of worms and moisture.
While trenching we found gopher tunnels into the garden, and often would find dirt in the trench under the holes as the gopher backfilled, trying to make a new dirt tunnel across the channel.
Along one active area I buried the wire, but also wanted to retard the invasion of Bermuda grass. Along with the wire I buried a couple of pieces of scrap 3/4″ plywood to make a physical boundry for the grass, and these happen to be right where a gopher tunnel was. The next morning I was in the garden and I heard a strange thumping sound, and finally realized that it was coming from underground where the wood was buried. The gopher was trying to get through the new wooden fence and wire!
We’ve buried wire around three sides (40′ long by 20 – 24″ deep), and are slaving away at the last trench where the most gopher activity is.
As we’re working, we’re also using a spade to collapse gopher tunnels from the back out, and using the smucky water (this batch is made from onion peels and bits leftover from pickling whole onions) to ruin those tunnels. We’re herding the gopher out of the garden and fertilizing at the same time.
We’ve a couple more bouts left to go before finishing; my partially numb hands are ready to be done with it. Narrow trenches in heavy clay right next to a fence aren’t easy to work in, which slows the process down a lot. Knowing that we’re being true to what we believe in, to not trap and kill in our garden, makes it all worth the work. The gopher is welcome to all the weed roots it wants elsewhere.