- Author: Ken Williams
Spring is fast approaching, looking at the window it may already be here!! And with the lack of rain now is a good time to check out that drip irrigation system and make sure it is ready to go. First of all what is drip irrigation? Drip irrigation is the process of applying water directly to the plant with a slow, steady application of water. Drip irrigation components come in a wide variety of application methods and delivery systems. For our discussion we will focus on a drip system that I have found to be very economical, reliable, and easily maintained.
First of all lets look at the components of the system starting with the point of connection:
- Point of connection is where we will tie into the main water source. It can be a tap off of the water line or tee-ed off of a hose bib (faucet). At the point of connection we will have our control valve or on/off valve. For an above ground installation the valve will need be an anti-siphon valve, located above ground and set to a height of 12 inches above the soil. Our control valve could also be a battery timer valve attached directly to the hose bib and the hose bib should have an anti-siphon device hooked to it as well (most new homes have these installed by the builders, older homes will have to add one). It is very important to keep irrigation water separated from the potable water source.
- Next is one of the most, if not the most, important part of any drip system, the filter. Drip filters come with different screen types and mesh sizes, generally for the home garden a nylon mesh of 200 micro pores is sufficient. This filter should be cleaned at least twice a year, good rule of thumb would be to clean prior to starting up the system in the spring and then again half way through the growing season, some time around July. Make it a celebration event, 4th of July filter cleaning will be like setting off fireworks for the plants. After cleaning the filter and putting it all back together, turn on the system and make sure you have no leaks.
- Next component is the drip regulator. Water pressure regulation is important. Most homes have an incoming water pressure in excess of 50 PSI, you will want your regulator to lower the pressure to 30 PSI.
- After the regulator we hook up the drip lines. This is usually done with a .710 drip line (irrigation experts generally call this ½ inside diameter tubing for simplicity). Off of our drip line we install the various components of the drip system. These call be low volume micro-spray units or drip emitters that range from (.5) ½ gallon per hour up 5 gallons per hour. I have found that the one gallon per hour emitter generally does a great job if it is installed properly and we regulate the time we water correctly. Installing the drip emitter should be on the up-hill side of the plant, for new plants that's right beside the root ball for established plants it would be at the drip line.
Drip irrigation maintenance is the key to a successful system and live plants. Turn on the system periodically and “walk” the system to ensure you have no leaks (generally they will show up readily as a stream of water that is hard to miss), make sure those emitters are dripping and not clogged up. And most important clean those filters. Dirty filters can cause emitters to clog and they can impede the amount of water running through the system.
Want to learn more about irrigation? Solano Community College Horticulture Department will be offering Hort 071 Irrigation Principles in the Fall Semester 2015.
- Author: Sterling Smith
With the mild winter were having, Poison Oak, Toxicodendron diversilobum, is leafing out earlier than usual. Clumps of tan stems with bright garnet leaflets of three are breaking their buds or it may take the form of a vine climbing into the canopy of a tree. It's common in Northern California up to about 5,000 Ft, and other parts of the West from Mexico to British Columbia. Later in the spring, small pale flowers and berries will be present. In our area, Poison Oak can turn red as early as July and begin to drop its leaves in late summer. The berries have a waxy white appearance when mature. An excellent cultural control is a herd of goats! Applications of herbicide are effective. Do not burn any trimmings or debris.
Poison Oak rash can be contracted year-around; the active compound is Urushiol. Dead, dormant plants, pets or soiled clothing can give you the rash. If you suspect you have been exposed, apply Tecnu or equivalent ASAP. An alternative is to apply isopropyl alcohol liberally with a cotton ball then rinse off with cool water before applying soap and water. Best remedy I know is to stay out of it. Good luck!
- Author: Karen Metz
As much as we feel guilty about enjoying the warmth and sunshine, it has felt so good to get out into the yard and garden. This time of year there are so many things to do. Some of them are things I probably should have done over the winter, like sharpen my loppers and hand pruners. Others are the usual getting ready for spring tasks like cutting back perennials,pulling up spent winter annuals, starting seeds indoors, fertilizing, perusing the stores and seeing which transplants I will put out after March 15. All the usual spring tasks.
This year I have some unusual spring garden chores to do that I haven't had to do in the past. I have to cut back my nasturtiums in my side yard that grow alongside my house but are now encroaching on the walkway. Sure I have to do this fairly regularly in summer, but never before at the start of spring. Usually the winter freezes decimate the plant and it comes back from self-sown seeds, but this year the vine looks gorgeous. It just didn't get cold enough, for long enough, to hurt the plant.
The other task that was a first, was pruning back the Hebe shrubs that are planted under the bay window at the front of the house. Now the pruning itself wasn't a first, but the pattern of the pruning sure was. My husband and I had to prune out a two foot by two foot area to allow the plumbers access to a water valve and line so they could replace the main water line bringing water from the street to our house. It had developed a leak over the last week or so, or at least that's when we noticed it. Our front lawn is quite sodden right now. Of course this is just the thing that you want to have happen in the middle of a drought.
Happily the leak was repaired today. The resultant huge gap in the hedge is pretty darned ugly. It is nice to be able to reach the faucet and valves without getting scratched up by branches. Maybe I can find another slightly smaller variety of Hebe to fill in the gap or maybe I will choose something else entirely. It is kind of exciting to have a space open up when you have an established landscape and a very small lot.
- Author: Trisha Rose
Well it's now 72 days until our garden party. It's been a good incentive to get out there and pull weeds, mulch and fill in some bare spots with new plants, be it succulents or perennials. I am still surprised at how prolific Euphorbia characias is, I find seedlings everywhere. At least weekly, or each time I go out on inspection, I find more little stems lurking under Lantana, Echium, or in the midst of a prickly rose bush. They have the best chance of short term survival amongst a rose since I usually don't have the right gear handy to tackle the thorns, so they escape until the next time I am armed appropriately. Problem is, I do like this cultivar IN ITS SPACE, just not everywhere! I finally put in some Coleonema pulchrum 'Sunset Gold' with small light pink flowers and chartreuse leaves, this cultivar only grows to 2' so perfect below my front window. Also put in Gaura, a drought tolerant long living perennial, with a wispy look, told to try and trim the spent flowers though to limit self sowing.
Happy to have this journey continue in this glorious weather.
- Author: Launa Herrmann
The newly purchased galvanized container that sits along my side yard fence outperformed itself for yet another season. In addition to last year's abundance of summer vegetables, I'm now enjoying winter vegetables. As you'll notice from the photos, I'm harvesting Swiss chard (Beta vulgaris) and bok choy (Cruciferae Brassica chinensis), and soon will be picking snow peas (Pisum salivum). Frankly, I can't ask for more in such a compact space.
This galvanized stock tank works for me. Available in a variety of shapes and sizes, this container sits at just the right height for tending vegetables and means less back-breaking work and fewer insects.
If you've never tried growing bok choy, give this member of the chard family a try. With its tasty, tender leaves and stalks, the charm of this cole crop lies in its versatility. The entire plant is edible, whether mature or immature. Simply snip off a few stems from each plant, chop up both the leaves and stems, then add to a stir fry or omelet. Within days new stalks will sprout on the old plant. Last fall I ordered two six-packs of bok choy from Vacaville's Pacific Hardware and look forward to a harvest through March.