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Enjoy Urban Farming While Being Water Smart

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Many San Diego County native plants and herbs have fruits and leaves you can harvest. They can be mixed into any climate-appropriate planting design. You don’t have to be a farmer to grow and enjoy them in your sustainable landscaping.

For the health of your urban farming crops, consider employing organic growing methods including sheet mulching and integrated pest management. This will ensure the health of your soil, your crops, and the people who eventually eat and enjoy them.

Check local drought ordinances in your area to confirm watering schedules permitted for edibles, which may be more flexible during the most active growing period. Because the San Diego region has a mild, warm climate throughout the year, you can plant most fruiting trees just about any time of the year. Citrus trees generally do best in our area when planted in May or June, but it is possible to plant them earlier or later in the year as long as there is no nighttime frost.

Arrange the urban farming area in your landscaping to take advantage of their irrigation needs in a designated area. If the rest of the landscaping is using minimal water, you can spare extra irrigation for your fruits and vegetables in their specific zone. For all landscaping, irrigate with the most efficient system possible.

Fruitful trees to enjoy

Fruit trees, especially citrus, thrive in San Diego County’s climates with just a little bit of care. The Pineapple Guava (Acca sellowiana) is a good choice with spectacular blooms. Photo: WIkimedia/Creative Commons License Edible Plants climate zone

Fruit trees, especially citrus, thrive in San Diego County’s climates with just a little bit of care. The Pineapple Guava (Acca sellowiana) is a good choice with spectacular blooms. Photo: Wikimedia/Creative Commons License

Fruit trees, especially citrus, thrive in San Diego’s regional climate zones with a  little bit of care. Top choices include:

Pomegranate (Punica granatum)

Chinese Date (Ziziphus jujuba)

Santa Rosa Plum (Prunus salicina)

Pineapple Guava (Acca sellowiana)

Improved Meyer Lemon (Citrus “Improved Meyer”)

This article is part of a year-long series inspired by the 71-page Sustainable Landscapes Program guidebook. The Water Authority and its partners also offer other great resources for landscaping upgrades, including free WaterSmart classes at WaterSmartSD.org.

The Desert Museum Palo Verde tree is an ideal low water use choice for Southern California landscaping. Photo: Danielle Bardgette/Creative Commons-Flickr trees

Waterwise Tree Choices for Watersmart Landscaping

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Trees are the single most valuable addition to your waterwise landscaping. Trees create improved water quality, resulting in less runoff and erosion. They also improve air quality and provide habitat for insects, birds, and animals. Healthy, mature trees are so beneficial, they can add an average of 10% to a property’s overall value.

When thoughtfully placed around buildings, the cooling and insulation created by a tree’s canopy can reduce air conditioning needs by 30%, and can save 20-to-50% of the energy used for heating.

Before you choose landscaping trees, research their size at maturity. When you first purchase it, it’s in a 15- or 25-gallon container and it’s hard to imagine it growing above your roofline. But a small tree can become a 30-foot tall tree with a 30-foot wide canopy of branches in a few short years. If you select a large tree species, it could be 70 feet tall and equally as wide.

Ensure tree placement gives you a sufficient distance away from your home or other structures. Small trees (30 feet wide or less at maturity) should be placed no closer than 10 feet. Large trees (70 feet wide or more at maturity) should be planted no closer than 20 feet from a house.

Top waterwise tree choices

The Desert Willow is an ideal tree for its size, flowers, and waterwise nature. Photo: Pixabay

Which trees are the best waterwise choices for the San Diego region? These are five proven favorites.

Desert Willow (Chilopsis linearis)

Desert Museum Palo Verde (Parkinsonia ‘Desert Museum’)

California Redbud (Cercis occidentalis)

Catalina Ironwood (Lyonothamus floribundus)

Hybrid Strawberry Tree (Arbutus ‘Manna’)

Consider large shrubs as alternative choices

Large shrubs can be smart alternatives for screening unwanted views. Be considerate of the viewshed of your neighborhood. Will the shrubs block a special view for others?

Several best choices of waterwise small  trees and shrubs for screening

California lilac (Ceanothus) is a native plant to San Diego County and produces spectacular blooms in early spring. Photo: Wikimedia

California lilac (Ceanothus) is a native plant to San Diego County and produces spectacular blooms in early spring. Photo: Wikimedia

Catalina Cherry (Prunus iliofolia ssp. Lyonii)

Pacific Was Myrtle (Myrica california)

Torrey Pine (Pinus torreyana)

Tecate Cypress (Cuppressus forbesii)

California Mountain Lilac (Ceanothus ‘Ray Hartman’)

This article is part of a year-long series inspired by the 71-page Sustainable Landscapes Program guidebook. The Water Authority and its partners also offer other great resources for landscaping upgrades, including free WaterSmart classes at WaterSmartSD.org.

Olivenhain Municipal Water District’s 2020 WaterSmart Landscape Contest winner Laura Lisauskas redid her family’s street-facing sloped side yard. Photo: Olivenhain Municipal Water District

Protect Your Hillsides and Slopes 

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San Diego County features many native canyons, and many homes are located in proximity to a native canyon. Native canyon hillsides near your home should not be disturbed. The more you can adapt your home’s landscaping to Nature’s landscaping, the healthier and more low maintenance it will be.

Your home may have been built on canyon slopes leveled or filled. When planting in previously disturbed or built slopes and hillsides, choose low-water use plants and trees, especially deep-rooted native plant species. Climate-appropriate plants with strong root structures are the best choices. Their powerful root systems can help hold your soil together.

Coarse compost and mulch can be applied directly to hillside and slope surfaces, providing protection from the force of rainfall and shading exposed soils, if your slope is gentle with a 33% grade or less. With occasional and gentle irrigation, mulch will “knit” together.

Compost blankets are another type of erosion control mat applied to the soil surface to protect and preserve it. They can be used alone, with coir mats or other organic-engineered material with biodegradable grids for stabilization. Mats allow water to penetrate through to the underlying soils while retaining loose soil and debris, preventing erosion. You can plant right through them, or use pre-seeded products.

Irrigation tips to help preserve hillsides

Be sure your irrigation plan takes into account hills and slopes to prevent wasting water and erosion. Photo: Pixabay

Prepping Hillside for planting

When preparing a hillside for planting, plan your irrigation before doing any work. Low-volume rotating spray heads are ideal for sloped areas, if the space is large and the groundcover is uniform. Inline emitter drip tubing can also be effective, especially for wider-spaced shrubs and trees.

Water can be applied in repeated short periods over the course of 24 hours so it can be fully absorbed between application times. Runoff, erosion, and efficient deep watering should be factored into all landscaping plans, but especially for hillsides.

NOTE: When using a drip irrigation system, emitters should be placed above the plant basin. Spray systems should have check valves in all lower heads to avoid low point runoff. Irrigation for the top of the slope and bottom of the slope should be on separate valves.

This article is part of a year-long series inspired by the 71-page Sustainable Landscapes Program guidebook. The Water Authority and its partners also offer other great resources for landscaping upgrades, including free WaterSmart classes at WaterSmartSD.org.

Scotch broom's blooms are pretty, but it is a non-native invasive species and should be avoided. Photo: Armen Nano/Pixabay

Five Pushy Plant Pests To Avoid

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San Diego County’s mild Mediterranean climate allows nearly any type of plants to flourish with adequate irrigation. But when non-native plants are planted alongside native plants, they do their best to take over.  These are plant pests. The worst of them overrun valuable native plant species. They drain limited rainfall and soil nutrients away from native plants which have developed the ability to better manage limited resources. The natives are not as aggressive and can’t compete with the non-native bullies.

Public enemies of your landscaping

Brazilian pepper trees are invasive with damaging roots. Photo: Sabine Schmidt/Pixabay

Brazilian pepper trees are invasive with damaging roots. They are non-native plants you should avoid in a watersmart landscape plan Photo: Sabine Schmidt/Pixabay

Plant pests

You may have planted a few of these common choices in your landscaping without knowing it. They are still sold commercially. These non-natives take up too much space to co-exist with native low-water use plants. If your landscaping gives pushy plant pests a home, remove them at the soonest opportunity.

  • African Fountain Grass
  • Periwinkle
  • Brazilian Pepper Tree
  • Scotch Broom
  • Mexican Feather Grass

Very few non-native specific offer any benefits to the San Diego region’s environment. Local animals and insects prefer native species for food and habitat. Invasive species should also be removed from commercial nursery stock, and shouldn’t ever be planted in the first place. You can help weed them out by removing them.

How to identify non-native plants

The California Invasive Plant Council maintains a list of invasive plants that cause problems throughout the state. This list only addresses plants that are a problem and may miss regional problems. For a list, visit the Plant Right website.

This article is part of a year-long series inspired by the 71-page Sustainable Landscapes Program guidebook. The Water Authority and its partners also offer other great resources for landscaping upgrades, including free WaterSmart classes at WaterSmartSD.org.

Inspired by the San Diego County Water Authority's free landscape workshops, Vallecitos Water District employee Eileen Koonce transformed her own landscaping. Photo: Vallecitos Water District example watersmart landscaping

Five Firefighting Plants Worth Adding to Your Landscaping

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As spring temperatures rise, San Diego County residents know wildfire season is not far behind. Although wildfire is a serious threat during warm, dry summer and fall months, wildfire can strike year-round especially in wildland interface areas. Regional landscaping must follow fire safe guidelines in design, plant selection and consistent maintenance.

Protecting your home with firefighting plants

Diagram from CAL FIRE illustrating the three zones for defensible space. Illustration: CAL FIRE

Plan your landscaping using three different zones

Zone 1: Landscapes should resist ignition and provide 35 feet of actively maintained defensible space around structures and access areas through smart design elements and plant selection. This maximizes fire prevention and allows access by fire crews to protect your property from fire if necessary.

Zone 2: Careful thinning of native vegetation for at least 65 additional feet, for a total of 100 feet of defensible space will reduce the chance of airborne embers from catching and spreading fire.

Zone 3: Some plants begin growth and start the germination process after a wildfire. Many of San Diego County’s native plant communities including chaparral can survive and recover from infrequent wildfires.

But the ability to survive is disrupted for even the most well-adapted plants when fires reoccur too frequently. Non-native, invasive plant species encourage more frequent, longer duration fires burning at a hotter intensity. It is critical to remove invasive plants in fire-prone areas.

Choose firefighting plants that resist ignition

Firesafe plants like these succulents are a smart choice for your watersmart landscape plan. Photo: City of Escondido Firefighting plants

Firesafe plants like these succulents are a smart choice for your watersmart landscape plan. Photo: City of Escondido

Some native plants can prevent airborne plant embers due to high salt or water content and low volatile oil content in their leaves. Succulents such as agaves, aloes and crassulas store extra water in their fleshy leaves guarding against drought, and they will help guard your property from wildfire.

Five exceptional firefighting plant choices include:

  • Daylily hybrids
  • Coral Aloe
  • Bush Morning Glory
  • California Sycamore trees
  • Indian Mallow

Rob wildfires of the fuel they need  

Messy, oily trees and shrubs like eucalyptus trees and junipers may flourish in Southern California, but they aren’t natives, and they provide ready fuel for wildfires. They ignite quickly, burning hot and long, releasing embers into the air which causes flames to spread.

Preventative maintenance includes removing dry grass, brush, weeds, litter, waste, and dead and dying vegetation. Trees should be regularly pruned. Shrubs should be thinned, with dead branches and leaves removed. Leave root structures intact to avoid erosion.

Dead leaves and branches are especially flammable on evergreen shrubs and vines like bougainvillea. Avoid planting these close to homes or other structures.

This article is part of a year-long series inspired by the 71-page Sustainable Landscapes Program guidebook. The Water Authority and its partners also offer other great resources for landscaping upgrades, including free WaterSmart classes at WaterSmartSD.org.

Bee's Bliss Sage (Salvia leucophylla) attracts pollinators including bees and butterflies to your landscaping. Photo: Wikipedia groundcovers to use

12 Grand Groundcovers to Use as Lawn Substitutes

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You’ve decided to eliminate the thirsty turf areas in your current landscaping when planning your new sustainable landscape. It’s tempting to install hardscape. It needs no water at all. It might seem like a smart idea, but it creates a new problem: stormwater runoff. It can also increase temperatures and add in its own small way to global warming.

Finding alternatives to cover the area with plants instead of hardscaping will help prevent too much stormwater runoff and capture rainfall.

Consider replacing your lawn with groundcovers. There are many good choices of groundcover plants that make good lawn substitutes. Many species grow well in San Diego County’s six climate zones and the Mediterranean climate natives fall into the very low or low Plant Factor categories. They won’t use as much water than the same amount of grass.

Very Low Plant Factor groundcover choices include:

California lilac (Ceanothus) is a native plant to San Diego County and produces spectacular blooms in early spring. Photo: Wikimedia

California lilac (Ceanothus) is a native plant to San Diego County and produces spectacular blooms in early spring. Photo: Wikimedia

Silver Carpet (Dymondia margaretae)

Bluff California Lilac (Ceanothus maritimus)

Low Plant Factor groundcover choices include:

Bee's Bliss Sage (Salvia leucophylla) attracts pollinators including bees and butterflies to your landscaping. Photo: Wikipedia groundcovers to use

Bee’s Bliss Sage (Salvia leucophylla) attracts pollinators including bees and butterflies to your landscaping. Photo: Wikipedia

Pink Yarrow (Achillea millefolium rosea)

Gold Coin Plant (Asteriscus maritumus)

Sundrops (Calylophus hartwegii)
Carmel Mountain ceanothus

Dwarf Mat Rush (Lomandra longfolia)

Bee’s Bliss Sage (Salvia)

Wooly Thyme (Thymus pseudolanguinosus)

Blue Chalksticks (Senecio serpens)

Moderate Plant Factor groundcover choices include:

The Beach Strawberry (Fragaria chiloensis) provides a display of white flowers. Photo: Wikimedia groundcovers to use

The Beach Strawberry (Fragaria chiloensis) provides a display of white flowers. Photo: Wikimedia

Creeping Manzanita ‘Carmel Sur’ (Arctostaphylos edmunsii)

Beach Strawberry (Fragaria chiloensis)

Pink yarrow, sages, and lilacs also support the lifecycle of butterflies, which are important pollinators.

 

This article is part of a year-long series inspired by the 71-page Sustainable Landscapes Program guidebook. The Water Authority and its partners also offer other great resources for landscaping upgrades, including free WaterSmart classes at WaterSmartSD.org.

Love Your Lawn-Conservation Corner-Love your lawn organically

Love Your Lawn Organically

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In a waterwise landscape, there’s still a place for turf. You may not need as much, and you need to create the most efficient and organic maintenance plan possible to work turf into your design. The good news: lawns maintained organically and with efficient irrigation can offer a cool, practical surface for active recreation, or just a nice place to relax with your family.

Most lawns require too much water and energy. They become pollution sources from excess fertilizers and pesticide runoff. When lawns are limited to accessible, usable, high-functioning spaces like children’s play yards, sports fields, and picnicking areas, you can prevent this.

Love your lawn organically

Reconsider the concept of lawns. They should not be passive, wall-to-wall groundcover. You don’t need to maintain so much lawn if you won’t enjoy it for the above purposes.

As you decide how much grass to keep in your plan, follow these guidelines to maintain it organically.

  • Top dress your lawn annually with one-eighth to one-quarter of compost.
  • Aerate and de-thatch your lawn annually.
  • Check and control irrigation overspray. Fix problems promptly.
  • Maintain three to four inches of height on cool season grass, and 1.5 to two inches of height on warm season grass.
  • Grass-cycle every time you mow.
  • Don’t allow seed heads to form on the grass. Remove seeds that do form.
  • Consider over-seeding with clover to help make the grass more interesting looking and more drought tolerant.
  • Eliminate the use of chemicals such as pesticides on your grass.
If you decide to keep your grass areas, follow these guidelines to maintain it organically. Photo: Alicja/Creative Commons

If you decide to keep your grass areas, follow these guidelines to maintain it organically. Photo: Alicja/Creative Commons

What’s the difference between Cool Season Grass and Warm Season Grass?

Cool Season Grass:

  • Needs more water than warm season grass and is considered a high use plant.
  • Requires watering in hot summers to prevent it from going dormant and turning brown.
  • Grows typically as bunch grasses and propagates by seed or weak stolons.
  • Cool season grass is easily smothered by sheet mulching.
  • Varieties include: Bent Grass (Agrostis), Fescue varieties (Festuca), Kentucky Bluegress (Poa pratensis), and Perennial Ryegrass (Lolium perenne).

Warm Season Grass:

  • Uses a moderate amount of water.
  • Thrives in daytime temperatures over 80 degrees. It will go dormant (brown) in winter months when it is cooler.
  • Grows from sturdy rhizomes extending deep underground.
  • Warm season grasses require physical removal and/or extensive sheet mulching (up to 12 inches).
  • Varieties inclue: Bermuda Grass (Cynodon dactylan), Blue Grama (Bouteloua gracilis), Buffalo Grass (Buchloe actyloides), St. Augustine Grass (Stenotaphrum secundatum), Zoysia, and Seashore Paspalum.

This article is part of a year-long series inspired by the 71-page Sustainable Landscapes Program guidebook. The Water Authority and its partners also offer other great resources for landscaping upgrades, including free WaterSmart classes at WaterSmartSD.org.

An example of drought tolerant landscaping with low water use plants. Photo: Kelly M. Grow, California Department of Water Resources landscape conserve

How Much Water Can Your New Landscape Conserve?

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Landscape designs using the least amount of potable water necessary are greatly encouraged in arid or Mediterranean climates like in San Diego County. It’s an important motivation for homeowners to consider efficiency and sustainability to lower water use, saving a precious resource.

Maximizing your landscaping’s ability to capture and use natural rainfall can also help reduce or even completely eliminate your reliance on potable water for irrigation.  Compare how much water your new landscape design will need against your existing landscaping’s water use. You’ll be able to estimate your future water savings.

Start by calculating the water use requirements of landscaping filled with plants that require high amounts of water, or moderate amounts, low or very low water requirements.

In these examples, evapotranspiration (ET), irrigation efficiency, and landscape area are exactly the same. The only difference: our examples are home to plants with different water requirements.

How to calculate your landscape’s water use

To calculate water use, you can refer to the San Diego Water Efficient Landscape Ordinance for guidance. Go to www.sdcounty.gov and search “Landscape Ordinance.” The four key variables are:

  1. Landscape Area (LA) – the square feet of area being landscaped with plants that require irrigation
  2. Evapotranspiration (ET) – this is the number in inches based on your San Diego Climate Zone
  3. Plant Factor (PF) – This is moderate, low, or very low depending on the plant selection
  4. Irrigation Efficiency (IE) – There is no such thing as a perfect irrigation system. Many factors can limit efficiency and impact your water use and the health of your plants.

Use a landscaped area of 1,000 square feet, with an ET of 51 inches annually, and IE of 0.7. Look at the big difference your plant selection can make in your water use.

Example 1: High Water Use plants (PF = 0.8) – 36,137 gallons of water per year

Example 2: Moderate Water Use plants (PF = 0.5) – 22, 586 gallons of water per year

Example 3: Low Water Use plants (PF = 0.2) – 9.034 gallons of water per year

Example 4: Very Low Water Use plants (PF = 0.1) – 4,517 gallons of water per year

From the highest estimate to the lowest estimate, you could potentially save 17,103 gallons of water every single year.

This article is part of a year-long series inspired by the 71-page Sustainable Landscapes Program guidebook. The Water Authority and its partners also offer other great resources for landscaping upgrades, including free WaterSmart classes at WaterSmartSD.org.

Knowing how to classify your plants by water use characteristics will help you plan your sustainable landscaping. Photo: Water Authority plant factor

Know Your Plant Factor Water Requirements

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Landscaping plants have different water needs. The water requirement of each plant in your landscaping can be determined by gathering information about the plant and then comparing it to the amount of water needed by the cool-season grass growing in your climate zone.

Take a tip from landscaping professionals. They use a resource called the Water Use Classification of Landscape Species to classify plants according to their water requirements, called Plant Factors.

These water requirements divide plant species into four categories: Very Low, Low, Moderate, and High.

When you are selecting plants for your landscaping, use the classification to choose low water use plants for your landscaping. You can also use it to group a handful of higher water use plants together if you want to indulge in a few favorites.

When you have decided on your plant palette and placement, you can now figure out the water use of your entire landscape area. This will help you plan out your artificial irrigation.

Factor in watering requirements

Determine water use before choosing plants for your new sustainable landscaping. Photo: San Diego County Water Authority

Watering needs for landscape plants use a measuring stick based on cool-season turf. It’s because cool-season turf is extremely thirsty.

When you replace turf areas with climate-appropriate plants that use less water and irrigate them with more efficient systems, you can conserve a tremendous amount of water. You don’t need to turn your landscaping into a dry and dusty area to do it.

High Plant Factor: Plants needing 60 to 100 percent of the water needed for a grass lawn (PF of 0.6 – 1.)

Moderate Plant Factor: Plants needing 30 to 60 percent of the water needed for a grass lawn (PF of 0.3 – 0.6)

Low Plant Factor: Plants needing 10 to 30 percent of the water needed for a grass lawn (PF of 0.1 – 0.3)

Very Low Plant Factor: Plants needing 10 percent or less of the water needed for a grass lawn (PF of less than 0.1)

Irrigate More Efficiently By Grouping Plants

According to the San Diego County Water Authority’s Sustainable Landscaping guidebook, plant selections are colored-coded to identify their water needs under this system. It gives you an easy way to group plants by their water requirements in your new landscaping, so you can irrigate them more efficiently.

This article is part of a year-long series inspired by the 71-page Sustainable Landscapes Program guidebook. The Water Authority and its partners also offer other great resources for landscaping upgrades, including free WaterSmart classes at WaterSmartSD.org.

Choose your landscape plants carefully to reduce your water use. watering your plants

One Simple Key to Watering Your Plants

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When you’re replacing your landscaping with an eye to conserving water, it’s important to understand how much water plants really need. A quick, simple way landscape experts do this is a method the home landscaper can use, too.

Evapotranspiration (ET) is the process of assessing various factors to determine how much water plants use, and when they need it. ET explains and incorporates important environmental conditions such as solar radiation (sunshine) or cloud cover. The stronger the sun’s rays, the higher the ET.

Plant leaves work a lot like mini solar panels. Leaves gather energy plants use to transform water and carbon dioxide from the air into oxygen and sugars for growing.

Transpiration of moisture through leaves is similar to perspiration. It cools down the leaves. Water also evaporates from the soil itself around plants. The combined water loss from the plants and the soil together makes up evapotranspiration.

Understanding water loss in terms of ET helps you select the right plants for your sustainable landscaping by assessing your overall landscape water requirements, planning irrigation, and managing the Soil Moisture Account.

Drought Tolerant Plants Share Four Common Qualities

Plants with silver, leather-like leaves like this Agave are extremely water efficient. Photo: Charlie Neuman watering your plants

Plants with silver, leather-like leaves like this Agave are extremely water efficient. Photo: San Diego County Water Authority

Do you need help identifying climate-appropriate plant choices for your new sustainable landscaping? Look for these four characteristics shared by drought-tolerant plants.

Stiff, Leathery Leaves: These leaves hold and store water, and stay evergreen most of the year.

Silver or Hairy Leaves: Light-colored leaves reflect sunlight to cool the plant. Hairy leaves hold moisture longer, and also protect the plant from hot direct sun.

Tiny Leaves: Tiny leaves are tiny solar panels. Lots of tiny leaves are easier to keep cool than a single larger leaf because there is more surface area to receive energy and use evaporation to cool down.

Solar Tracking Leaves: Some plant leaves are sun worshipers. They will turn toward the sun’s path throughout the day. As the day progresses, you will see the leaves more horizontally oriented. The plant is shifting its solar panel leaves to minimize sun exposure. Many California native plants like manzanitas have this ingenious adaptation.

The Water Authority’s Sustainable Landscaping guidebook contains a Plant List with climate-appropriate plants. They are also highlighted throughout the guidebook.

This article is part of a year-long series inspired by the 71-page Sustainable Landscapes Program guidebook. The Water Authority and its partners also offer other great resources for landscaping upgrades, including free WaterSmart classes at WaterSmartSD.org.