Help for the Gardener from the Contra Costa Master Gardener Help Desk

Client's Request: I am looking for advice on a drought tolerant grass variety or mix for my front yard. We are located in San Ramon, and the area receives full sun. We have taken out our existing lawn! We will have edibles, water permeable surfaces, paths and a small amount of grass (or other suitable ground cover), about 200 ft². This will be mostly ornamental, although one area (next to the driveway) will likely receive some foot traffic. I identified UC Davis Buffalo grass as a possibility, but we are open to anything that makes sense. Most important are low water requirement and low maintenance, ability to tolerate some foot traffic, open to a longer ‘shaggy' growth habit, although the ability to mow to a shorter length would be nice. Full sun environment. Soil is good I think, some clay but not too heavy, drains well.

CCMG Help Desk Response:  Congratulations on taking the first step towards a water-wise garden by removing your lawn. It's important that we all learn how to use water more efficiently as demand rises and drought conditions continue. You would like to retain a small lawn which will receive foot traffic next to the driveway and would like advice on grass selection.

Before evaluating lawn alternatives, it is important to understand the differences between the two categories of grasses. Grasses are considered warm-season or cool-season, depending on when they grow best. In California warm-season grasses (e.g Bermuda, St. Augustine, buffalo) generally do best in southern California while cool-season grasses (e.g. blue, rye, fescue, bent) do best north of the Bay Area. In between is a transition zone, where both cool-season and warm-season grasses will grow but the climate is not optimum for either. Warm-season grasses tend to turn brown and go dormant during the winter in areas where there is frost, such as San Ramon. And cool season grasses require extra water to endure our hot dry summers.

Below are several options for lower water use grasses which can tolerate foot traffic. However, none of the grasses listed below currently qualify for your Water District's (EBMUD) lawn conversion rebates, nor does synthetic turf. In order to qualify for a lawn conversion rebate, EBMUD requires that the lawn be replaced with low or very low water-use plants, or permeable lawn alternatives such as decomposed granite or mulch.

Native Bentgrass - Agrostis pallens is a cool-season California native bentgrass, with a uniform growing habit, medium texture, and deep green color. Native bentgrass requires full sun, withstands foot traffic, and has a good wear recovery due to self repairing rhizomes. Native bentgrass can be either mowed or it can be left to flop, creating the look of a natural, informal meadow. If you want the look of a mowed lawn, you should continually mow it. If you let it get long and shaggy before mowing it low, it will have a scalped look until it has had time to grow back. The sod grower's irrigation trials indicate that Native Bentgrass requires about half the water of a traditional cool-season grass to keep the lawn green throughout the year. Starting a native bentgrass lawn from seed can be a challenge because it is slow to start. But it has recently been made available as sod with degradable netting from Delta Bluegrass Company in Stockton. The price of Native Bentgrass sod is more than that of traditional blue, rye, or fescue sods because it takes longer for the grower to produce. If cost is not the primary factor, a Native Bentgrass sod might make a great alternative to your conventional lawn. For more information on this California Native Sod, see http://www.deltabluegrass.com/blendcomparisonchart .

UC Verde Buffalograss - UC Verde is a variety of buffalograss which was developed by University of California researchers at Riverside and Davis as a lower water use alternative to the traditional cool and warm-season grasses. It is a warm-season grass native to the North American plains; it looks terrific during summer; and is soft on bare feet. But its main drawback is that in Northern California it goes fully dormant in the winter, turning straw-colored after a hard frost occurs. People often use a biodegradable green dye during the winter in order to maintain the appearance of a green lawn. UC Verde grows to only 4-6" tall and requires mowing only every 2-3 weeks. It is planted from plugs which are usually spaced 12 inches apart and should be planted early in the warm season (e.g. May) to give the lawn a chance to establish before the weather cools. It spreads by rhizomes and is very competitive with weeds once established. However, keeping the lawn weed-free until it becomes fully established is more challenging than installing sod, and may require an aggressive weeding campaign. UC Verde buffalograss requires 50% to 75% less water than the typical fescue lawn. For more information on growing and maintaining UC Verde buffalograss, including photos of the grass throughout the season, see http://cesacramento.ucanr.edu/Pomology/Turf_Demonstration_Project/Three_species_in_irrigation_trial/UC_Verde_buffalograss/ .

No-Mow Fineleaf Fescue – Fineleaf fescues are cool-season grasses which include red fescue, Chewings fescue, sheep fescue and hard fescue. Many new and improved fineleaf fescue species and cultivars have come to California in recent years. Fineleaf fescues can be either seeded or sodded. They typically require about 85% of the water needed to keep a typical lawn green in the summer but they can withstand more severe irrigation deficit and dormancy with the ability to come back the following year. Fineleaf fescue lawns can be kept to about 2 ½" by mowing every 2 to 3 weeks or they can be left to grow to a height of 6 to 12 inches to create a "natural" look by mowing 1 to 4 times per year. They are an aesthetically pleasing no-mow grassy groundcover, with lower water requirements, however, they are not suitable for areas where pedestrian traffic is common. For more information on fineleaf fescue, see the attached U.C. article "No-Mow Fineleaf Fescue Grasses for California Urban Landscapes" (http://anrcatalog.ucdavis.edu/pdf/8391.pdf).

Irrigation – Whichever grass you select, your irrigation system plays an important role in water conservation. Standard spray irrigation heads are not an efficient method of applying water. You might consider replacing conventional sprinkler nozzles with high-efficiency rotating or precision nozzles. Or perhaps install a below grade inline emitter system such as Eco-mat by Hunter irrigation http://www.hunterindustries.com/irrigation-product/micro-irrigation/eco-matr-and-pld-esd . Replacing traditional irrigation timers with weather-based models (smart controllers) can help to provide the amount of water actually required by the plant, and often results in water savings. If you are redoing you irrigation system, you might want to check out the water district's rebates, if any, for upgrading irrigation equipment and installing Smart Controllers (for EBMUD see  http://www.ebmud.com/for-customers/water-conservation-rebates-and-services/lawn-conversion-irrigation-upgrade-rebates).

Good luck with your project. Feel free to contact us if you need additional information.

Contra Costa Master Gardeners' Help Desk

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Note: The Contra Costa Master Gardener Help Desk is available year-round to answer your gardening questions.  Except for a few holidays, we're open every week, Monday through Thursday for walk-ins from 9:00 am to Noon at 75 Santa Barbara Road, 2d Floor, Pleasant Hill, CA  94523. We can also be reached via telephone:  (925) 646-6586, email: ccmg@ucanr.edu, or on the web at http://ccmg.ucanr.edu/Ask_Us/

Advice for the Home Gardener from the Contra Costa Master Gardeners' Help Desk

Client's Questions and Concerns
Client called with “huge problem with birch trees". She left her email address, but also asked for someone to call and help her with some advice. Called several times but couldn't leave a message since her voicemail box was full. Sent her an email with some of the “usual” problems with birch trees and asked her to contact us if she needed more information. (Note:  Although this advice didn't come to satisfactory conclusions, CCMG Help Desk thought it would be beneficial to remind gardeners of the value and care of their trees, especially the oft-planted and vulnerable birch trees, and the need for prioritizing tree care especially during the drought. You can replace and restore many shrubs and perennials in several years and at moderate costs; replacing trees can be expensive when you include value to the property and costs of removal, and can take many years.)

Response and Advice from the CCMG Help Desk
Thank you for calling Master Gardeners with your birch tree problem. However, in order to help you, we will need some more information and either samples or photos of the tree.

I did try calling you, but your voicemail box is full so I could not leave a message. If you would like to call us or e-mail with details such as: where do you live; where are the trees planted; how old are the trees; your irrigation routine; and any recent changes in their vicinity. With this information, we can start trying to identify what may be the problem with your birch trees.

In the meantime, I have included information which might be helpful adapted from an article from a Solano County Master Gardener blog:

• Most likely your birch tree is a European white birch (Betula pendula), native to northern Europe with its cooler climes and plenty of rainfall to sustain the trees. They grow magnificently there, and to their full potential, much larger than any you'll likely see in Contra Costa County.
• In Contra Costa County, especially the central and eastern areas, the life span of a birch tree is approximately 25 years due to heat and lack of rainfall. Decline will often show in branch dieback or leaf drop. During drought, birch trees – which need consistent and deep irrigation – will show signs of stress such as dead branches. Or depending upon the tree's age and care, those dead branches may just be signs of old age and a steady decline.
• Many homeowners with birch don't realize how stressed birch trees can get in drought periods. The natural habitat of birch trees is the forest, where they grow alongside creeks and streams.
• Birch are often planted in lawns and home owners forget that when they stop or reduce irrigating their lawns that birch will often be put in stress unless additional water is provided.
  • If your tree is in a lawn, remove the grass from around the trunk out to the drip line and replace it with a layer of fine bark mulch, chopped red cedar bark or aged compost. A bender board around the perimeter of the mulch will prevent the mulch from working into the lawn.
• To determine the actual soil moisture “feeding” your birch, you can push a long screwdriver into the soil, working outward from the trunk to the drip line under the leaves. If the screwdriver does not easily penetrate the soil, then the tree must be irrigated.
  • One method of supplemental tree irrigation is to lay several lengths of soaker hoses, working outward from the trunk to the perimeter of the tree under the drip line. Attach a garden hose to the soaker hose and let the water drip for several hours until the screwdriver will easily slip into the soil. You can find a rmuch more duable and automated version of this watering system at http://ccuh.ucdavis.edu/public/drought/tree-ring-irrigation-contraption-tric-1/tree-ring-irrigation-contraption-tric
• The birch root system is also extremely sensitive to fertilizers and herbicides, including weed and feed products as well as mechanical damage, for example string trimmers.
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  Bronze Birch Borer holes
  photo: Vacavilletreeservice.com
  When birches get stressed during even our “usual” Northern California summer droughts, borers can move in. This problem is often exacerbated by reduced irrigation during our current long-term drought. The bronze birch borer, Agrilus anxius, is the main culprit. Apparently there is quite a large local population of the borers. Intensive insecticide applications may keep them at bay. Check the University of California Statewide Integrated Pest Management website for more information on preventive measures: http://www.ipm.ucdavis.edu/PMG/GARDEN/PLANTS/birch.html.
  If you go to this link and in the right columns scroll down to 'birch borers', you might find clues to what is ailing your tree bug-wise. However, it is important to positively identify the cause before any measures are taken to manage the problem, so we look forward to hearing from you again.

 With a little TLC, you should be able to coax a few more years out of your birch.

 Contra Costa Master Gardeners' Help Desk

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Note: The Contra Costa Master Gardener Help Desk is available year-round to answer your gardening questions.  Except for a few holidays, we're open every week, Monday through Thursday for walk-ins from 9:00 am to Noon at 75 Santa Barbara Road, 2d Floor, Pleasant Hill, CA  94523. We can also be reached via telephone:  (925) 646-6586, email: ccmg@ucanr.edu, or on the web at http://ccmg.ucanr.edu/Ask_Us/

"Me mind on fire -- Me soul on fire -- Feeling hot hot hot" are not just lyrics to the catchy one-hit wonder by Buster Poindexter.  It's also what we've been thinking (and our plants have been feeling) this summer. Although as of September 22nd, the season technically shifted from summer to fall, the temperatures have remained in the mid- to high 90's.

The hot sun and high temperatures can be brutal on a garden causing plants and vegetables to wilt, and soils to dry out.  This isn't only about the heat and sun though; when diminished water availability is added to the scenario, it becomes about the effects that all three combined have on the garden.  The goal this year has been to keep a healthy amount of moisture in the soil using less water.

With the water restrictions still in effect, it's important to look at ways to grow a fall garden with less water.  One way to do that is by using row covers or shade cloths.

Protecting the plants from direct sunlight by using row covers or shade cloth reduces the leaf temperature and plant watering needs (they don't "sweat" as much).  This can raise the production of your garden and reduce your irrigating and fertilizing costs.  Its also useful in protecting your vegetable patch from insects and birds.

Row covers are often used in the winter to protect plants from frost, and during the spring and summer months to block out the sun. However, consider using them during the early fall season to protect your newly planted "cool" season crops from the sun and heat. Row covers generally block out 15-30% of the sun, depending upon the thickness of the cloth.

With the autumnal heat we've been having, shade cloth, which is a little heavier, might be an even better way to go. It comes in a variety of colors and densities depending upon the amount of sun to be blocked and what vegetables or plants need protection.  While light colored shade cloth will reflect more of the sun's rays and heat, expect higher temperatures under darker shade cloth, unless you provide ample air space.

Shade cloth requires a simple support structure consisting of PVC or metal bows that span one or more rows. The bows support the shade cloth over the crop, providing cooling shade and reducing water needs.

If you are planting a vegetable garden, understanding the light requirements of each crop may allow you to plant some crops in a naturally shaded environment.  Lettuce, currants, gooseberries, spinach, cauliflower and most beans can grow in conditions with less than full sun.  Under these conditions, water use needs will be reduced due to the natural cooling of the plant.

Even plants that require full sun and love the heat (80-90°), such as peppers and tomatoes, sometimes need shade cloth too due to the intense summer sun or heat. I placed shade cloth over my tomatoes this summer when the temperatures were especially high.

Shade cloth can be placed over plants during the hottest time of the day (11 am to 4 pm) to keep them from getting sunburned or stressed.  Sun damage can result in wilted or burned leaves and skin. Many of the cool season crops will bolt or go to seed prematurely in higher temperatures, and leafy vegetables turn bitter in taste.

 

Seedlings and recently transplanted starters do best with reduced sun until they are established. Initially, a shade cloth with a 10% percent density is perfect for sun-loving plants; 30% density cloth is best for more sun sensitive plants.  This weight of cloth can also provide some protection from the drying effects of wind.  During the hot summer months, most vegetable garden plants require 40% to 60% percent protection from the sun. Even though we are now in October, given the high temperatures were experiencing, using a 40-50% shade cloth to cover the newly planted crops can help with reducing the temperature. Shade can lower plant and soil temperatures by as much as 10°F.

Row covers and shade cloth can be purchased at many garden centers or online. I purchase mine online because of the broader selection.

As we move into August, with its typical dog days of summer, we always need to make sure that the plants in our gardens, edible or ornamental, get the water they need.  After back-to-back years of winter droughts in much of the west, it is more problematic this summer.  Most California water districts, including EBMUD, have asked everyone to cut back on residential water use by at least 10%.  

There are several things that a gardener can do that are fairly painless, and most are not too expensive, to help keep your plants, and your local water district, happy till the hoped-for rains begin later this Fall.

Saving Shower Water

Most home improvement/hardware stores carry five-gallon paint buckets. These work well when placed at the bottom of the shower, for collecting water as it is heating up for your shower.

 You don't want to let the bucket fill more than half full, as it becomes unwieldy. But you can usually capture the water from two shower "warm-ups" into one bucket before having to empty it.  Make sure to place it outside the shower before you get in so that soap/shampoo/etc. will not contaminate the water. You could also do this in your kitchen sink, while waiting for the water to warm up before doing pots and pans, by using a smaller bucket. Five-gallon buckets can be had for under $3, and bought in packs of three (3) for under $9. 

Water Storage  

• Bucket: You will likely go through the captured water in day or two, so you may not need more than a couple of buckets for storage. 

• Trash Cans: For storing larger quantities of water, a clean 32-gallon trash with lid, is a good vessel for this.  The lid is important because you don't want mosquitos to use your saved "still" water for laying larvae, and without that lid, they will.  A new 32-gallon can with lid is available at home improvement stores for under $20.

• Wine Barrels: For more attractive water storage, though more expensive, buy a used wine barrel, which holds 55 gallons.  You can by one on the internet or contact local wineries to purchase a barrel that they are "retiring".
  
  The wineries will usually sell a used barrel for around $40. You will need to get a plug for the bung hole, the big hole at the belly of the barrel which they use to fill and taste the wine (in the picture to the right you can see the bung hole on the right-side of the barrel). Alternatively you could make a lid out of one end if you cut the top of the barrel off.  To make it even fancier, you could add a spigot near the bottom. Or put the barrel on its side, and use the bung hole to fill and syphon water, just keep the plug in to prevent mosquitos.  

Drip Irrigation

Drip Irrigation, particularly a with "Smart" Controller is ideal for conserving water for vegetable gardens, perennials, shrubs and young trees. But if the smart controller proves too costly, you can create a drip system that you use manually.

Fertilizers and Mulch

• Use organic fertilizers rather then synthetic fertilizer.  It improves the quality of the soil, enabling the water to better move through it to the plants where it is needed. 
• Adding mulch around shrubs and trees will help prevent evaporation of water from the soil, requiring less frequent watering.

Happy Watering!