What is a Sustainable Garden?
A sustainable garden works in harmony with nature. There are many techniques that can improve the health of your garden and minimize any negative impact on the environment. Most are easy and fun and will save you time in the long run. Sustainable gardening includes:
Organic gardening is growing food without the use of petrochemical pesticides, herbicides and inorganic fertilizers that pollute our soil and water. It relies on the use of beneficial insects, diversity of plants, and the use of compost to supply the soil with nutrients.
Native Plants and Trees
Planting native plants and trees is one of the best ways to work with, rather than against, nature. By matching plant species to your particular area you will have plants and trees that take less care and energy and will be healthier than exotic species. Another benefit is that native birds, insects, and other wildlife have evolved with native plant species and are able to use the fruits, nectars and habitat these plants and trees provide. There are many native plant nurseries in the area including Yerba Buena Nursery in Half Moon Bay.
Every spring there is a Going Native Garden Tour that includes gardens in San Mateo County. The Tour website also has information on public native gardens and native plants.
Double digging helps the soil hold more water, improves aeration and places organic material at a depth that enables plant roots to adequately extend. John Jeavons, the leading pioneer in biointensive farming, attributes the technique of double digging and adding compost to build humus and soil fertility, the basis of his success which he describes as "growing the soil."
Drip irrigation is a controlled, slow application of water that flows under low pressure through plastic pipe or hose laid along each row of plants. The water drips out of tiny holes that are made in the hose wall or from fittings called emitters that are plugged into the wall at proper spacing. Soil moisture remains constant, and air is always available. By delivering water directly to plants, little is lost to evaporation or runoff so this technique is very water efficient. A variety of emitters allow the proper amount of water to be delivered to each individual plant. It is one of the best techniques for watering gardens, fruit trees, vines and container plants.
The Department of Water Resources AB 2717 Landscape Task Force was started to "make recommendations leading to comprehensive actions that will improve landscaping water use efficiency." The task force report findings, recommendations and actions can be found on their website.
Mulch protects the soil by helping it retain moisture, suppresses weeds and insulates plants from extreme temperatures. Any material such as wood chips, straw, nut shells, paper, sawdust, leaves, seaweed, grass clippings or compost can be used as a mulch. Mulching is a way to recycle materials that might otherwise be discarded and simultaneously improve your soil.
In our efforts to grow a maximum amount of food, we have come to view all insects as enemies. We have created chemical fertilizers to encourage growth and poisons to kill pests. Most are indiscriminate and kill beneficial organisms too, upsetting the natural balance, and, when it rains, the chemical runoff poisons our ground water, rivers and bay. Using IPM methods is a better way to control pests and keep a healthy, natural balance in your garden. IPM techniques can be as simple as planting companion plants to attract beneficial insects, introducing beneficial insects to your garden or making your own pesticides from ingredients you may already have on hand such as borax, ammonia and beer. IPM controls are preferable to chemical pesticides. However, when it is absolutely necessary to use a pesticide, choose the least toxic product.
Learn to tolerate a certain amount of pests. In an organic garden there are a few pests, but there is also an army of beneficial insects, spiders, reptiles and birds waiting to have a pest for lunch.
Plants that attract beneficial insects
Baby blue eyes (Nemophila)
California Lilac (Ceanothus)
California Poppy (Eschscholzia californica)
Chervil (Anthriscus cerefolium)
Coriander (Coriander sativum)
Coyote bush (Baccharis pilularis)
Dill (Anethum graveolens)
Elderberry (Sambucus mexicana)
Fennel (Foeniculum vulgare)
Holly–leaved cherry (Prunus ilicifolia)
Monkey flower (Mimulus)
Native buckwheat (Eriogonum)
Queen Anne's lace (Daucus carota)
Rosemary (Rosmarinus officinalis)
Sweet alyssum (Lobularia maritime)
Tidy–tips (Lobularia maritime)
Yarrow (Achillea spp.)
Recycle and Re–use
Items that are normally thrown away can be used in the garden. Paint–stirring sticks and old forks can be used to display vegetable seed packets. A broken pot can be a toad house. An old chair or table can hold container plants. Make your garden fun and whimsical and a joy to visit.
Rigid, black plastic pots that bring plants into your garden can be returned to nurseries for growers to re–use. Local nurseries accepting pots for re–use.Friends You Should Invite Into Your Garden!
Ladybugs — This aphid loving beetle is worth its weight in gold.
Lizards — Alligator lizards will search dark basements, garages and bushes for their favorite meal – black widow spiders.
Spiders — The average spider eats about 100 insects a year. He's one of the good guys.
Toads — One toad can eat between 10,000 and 20,000 slugs, flies, grubs, cutworms or grasshoppers per year.
Bats — Besides being a valuable pollinator, bats consume large quantities of insects. A single little brown bat can catch 600 mosquitoes in one hour.
Bees — In California alone, forty–two different nut, fruit, vegetable, forage and seed crops rely directly on bee pollination.
Green Lacewings — Green Lacewings will eat mites, mealy bugs and other small insects but their favorite meal is aphids.
Ground Beetles — Ground beetles' favorite insect meals are cutworms, grubs and root maggots. Some even love slugs and snails. To invite them into your garden, place a log or board at one end of your garden.
Hover Flies — These flies look like little flying helicopters. They are some of the garden's greatest allies. They feed on flower nectar, which makes them excellent pollinators. Their favorite meals are aphids and mealy bugs.
Hummingbirds — These small birds consume more than half their total weight in food everyday and a big part of their diet is insects.