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Learn to match plant choices to your microclimate map. Photo: Charlie Neuman, Water Authority

How to Choose Plants for Landscape Microclimates

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Every garden has completely different cultivation characteristics, even those located in the same general climate zone. For example, there will be areas where plants will flourish.

Numerous features affect your growing conditions. Structures, walls, fences, and other plants can affect the amount of sun and shade in a garden. There can be hills and hollows in your front yard that may collect cold air. Or, because your property is sloped, you don’t get frost when your neighbors do.

Individual microclimates may differ significantly from the general climate of an area. To be sure you match the right plant choices to your conditions, you need to identify and map these microclimates. Start by walking around your property at different times of day. Observe conditions and take notes.

Choose plants that will thrive

Determine which plants will work in your new garden, and which should be removed or avoided. Outline the canopy area of the plants being retained. Note the name, general size, and health of the plants.

Do any of these plants seem “unthirsty?” Many plants can thrive on less water when they are well established, with deep healthy roots. Old rose bushes and large shade trees are two good examples. These drought-tolerant plants are worth keeping if possible, especially if they are mature.

Note sun and shade patterns

Different areas of your landscaping are affected by shade, moisture, and temperature, creating a variety of microclimates. Photo: Water Authority

Different areas of your landscaping are affected by shade, moisture, and temperature, creating a variety of microclimates. Photo: San Diego County Water Authority

Mark the areas that receive sun all day, and areas that are shaded all or part of the day. Also note which areas receive only partial sun, or a few hours of direct morning sun, midday sun, or late afternoon sun.

In choosing landscaping plants, make sure to select those that are appropriate to the sunlight patterns of the garden. Plants marked as “full sun” will not be happy in full shade, and vice versa. Don’t work against their requirements.

Group plants for similar needs

Group plants with similar water requirements together. Make sure plants with different water needs are not combined. Some sun-loving plants have moderate water needs, and some have very low water needs. If these are mixed together, one will always suffer if the watering routine works for the other types. 

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

Attract pollinators to your watersmart landscaping with native plants such as milkweed. Photo: Erin Lindley

Attracting Pollinators to Your Garden

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Flowering plants rely on insects, birds, and other creators for pollination. In turn, plants attracting pollinators feed and house beneficial insects like bees and butterflies, and nectar-loving birds like hummingbirds.

Some bugs eat too much, destroying their plant hosts and spreading disease. Other beneficial insects fight off the destructive species, eating them or disrupting their reproductive process.  Birds, bats, and lizards help too, consuming pests both large and small.

Nature provides checks and balances in a garden. You can attract insects and creatures which will help maintain the health of a garden without pesticides.

Choosing a wide diversity of plants in your landscape can help attract helpful insects and predators on a regular basis. They improve the resilience of the garden and reduce the need to use chemicals for pest control.

To attract more garden helpers, create habitat for them. Consider adding a nesting box for bees. Leave a small rock pile for lizards to inhabit. Put a large tree branch in the garden and let it decompose naturally.

Planting a Butterfly Garden

Planting Narrowleaf Milkweed prohibits habitat and for the endangered Monarch butterfly. Photo: Wikimedia Attracting Pollinators

Planting Narrowleaf Milkweed prohibits habitat and for the endangered Monarch butterfly. Photo: Wikimedia

Numerous plants attract pollinators and support the life cycle of butterflies, including the threatened monarch butterfly.  Plant several in the garden to help the larvae and caterpillars as well as the full-grown, nectar-seeking adults. Some good choices:

  • Narrow Leaf Milkweed (Asclepias fascicularis)
  • Island Alum Root (Heuchera maxima)
  • San Miguel Island Buckwheat (Eriogonum grande var. rubescens)
  • Cedros Island Verbena (Verbena lilacina)
  • Island Bush Snapdragon (Gambelia speciosa)

What’s The Buzz?

Leave open soil around plants for ground-nesting bees and insects. Photo: Pixabay/Creative Commons Attracting Pollinators

Leave open soil around plants for ground-nesting bees and insects. Photo: Pixabay/Creative Commons

Not all ground needs to be covered in mulch. Try designating a five to ten square foot patch of open soil around plants for ground-nesting bees and insects, especially if your garden contains San Diego native plants. Succulents don’t like mulch right up against their stems, for example. Create a landscape where plants and pollinators work together 

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

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.

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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.

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.

 

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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.

Five Firefighting Plants Worth Adding to Your Landscaping

/in , , /by /Water News Network Mentioned: San Diego County Water Authority

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

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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.