Consider the amount of time you wish to spend maintaining the garden. A low-maintenance garden will use mainly woody plants (trees and shrubs) and deep-rooted low-maintenance perennials like ornamental grasses, grouping them in masses. There will be only a few focal perennials.
Low-maintenance planting design: More than just plant selection
Grouping plants by water need makes irrigation more efficient. To maximize water savings, consider restricting high-water-need plants to a few strategically placed accents or focal points, convenient to a water source.
Northern CA Regional Water Authority: Rules of Thumb for Waterwise Gardening
While deeper-rooted plants do not always use less water, they are less dependent on water close to the soil surface. Water near the surface is easily lost to evaporation in the absence of mulch and even with mulch, becomes depleted in the prolonged absence of precipitation.
Most Piedmont native/naturalized plants will grow well with just the water that nature provides once they are well-established. Proper watering during establishment, usually for the first year, is still critical. Native plants also have deeper root systems than many common ornamentals, increasing the ability of our heavy clay soils to absorb and retain water. Natives thus reduce stormwater runoff and the associated water pollution. See Ornamentals for detailed lists of plants suitable for our area.
Mid America Regional Council, Kansas City
By lowering the temperature, shade reduces water loss in two ways:
Shade can even reduce water loss when the plants themselves are in sun, because high shade over hard surfaces such as driveways reduces radiant heating of adjacent plant beds.
Choose shade trees that permit underplanting:
Shade varies with time of day and time of year. Areas in full sun in the summer may be in partial shade in spring and fall when the sun is at a lower angle in the sky.
The sun affects the temperature on each side of your home, and warmer temperatures create a drier environment. Note that you can modify temperature with plantings. Deciduous trees placed to the south and west of your home will create summer shade but permit winter light.
Federal Coordinated Technology Implementation Program Roadside Revegetation Portal: An integrated approach to establishing native plants
Deepest of shade; under shrubs, porches, decks, dark corners, narrow passages between houses or buildings; ground is usually dark and dry. Plants will struggle under these conditions. Because plants need light to photosynthesize and produce food, only those with low metabolism can survive.
Total shade all day, no direct light but some indirect light; under low branching trees, trees with large leaves and evergreen trees, sometimes the north side of buildings and fences, especially if a tree is nearby. Less than ¼ of the sky is visible through the tree canopy.
Shaded 4–6 hours in either the morning or afternoon; typically the edge of a wooded area or the west or east side of a house or fence. This area is best for plants that can take direct sun, but don’t like our summer heat. Select plants based on the type of sun the area receives. Generally, plants that prefer cooler conditions benefit from sun in the morning and afternoon shade during the heat of the day, while plants that love heat benefit from shade in the morning and hot sun in the afternoon.
Under tall, high-branching trees with small leaves or near walls and fences without overhead branches; shaded 3–4 hours per day, receives bright indirect light plus considerable direct light.
Plants prefer more shade than sun. For Orange County, this means morning sun, afternoon shade. Some shade lovers, like Aucuba japonica, have new leaves that are very sensitive to sunlight and should be planted where they will also receive shade in winter.
Plants prefer more sun than shade. Plants will tolerate light to medium shade for part of the day.
Plants need at least 6 hours of full sun per day. With less, they will stretch, lean, flower intermittently, have sparse foliage or have disease issues.
Gardening in the Shade
Plants for Dry Shade
Shade gardens are subtle, employing differences in plant texture, height, form and color to add visual interest.
Texture can be coarse (large-leafed plants such as hostas or Aucuba) or fine, like many ferns and grassy perennials (mondo grass, liriope and some sedges) or shrubs with small leaves (boxwood performs well in woodland gardens) or needle-like leaves (plum-yew). A contrast betweeen glossy leaves (Bergenia, Aucuba, evergreen Asarums) and matte leaves (Siberian bugloss, deciduous Asarum) is very effective.
Weeping or rounded forms add a spacious feeling to plantings otherwise dominated by upright or horizontal, ground-hugging plant forms.
Light colors — whites, cream, gold or pinks — stand out in the shade, while deep blues and purples tend to recede unless set off by a lighter, contrasting color. Red- or purple-leafed plants such as some Heuchera, Japanese maple or Loropetalum cultivars contrast well with both green or light-colored plant leaves.
Water is lost from soil by evaporation and from plants by transpiration from leaf surfaces. Winds during winter and spring can be fierce and can cause significant evaporative loss from soil and transpirative loss from susceptible plants, as well as erosion from dormant garden areas. A properly designed windbreak reduces both evaporation and transpiration loss, as well as creating valuable habitat for wildlife.
Generally, a windbreak protects an area 10-15 times its average height.
A windbreak actually should not be solid like dense evergreens or a board fence. A windbreak with 40–60% density in two staggered rows works well and should be comprised of a diversity of species to discourage diseases that can plague monocultures.
Reducing lawn size saves more water than any other design strategy. Try using turf as an accent rather than a main feature. A small, thoughtfully designed and properly maintained lawn can provide as much beauty as a larger expanse with only a fraction of the water and maintenance requirements. At a minimum, turf should not be placed in narrow, hard to irrigate areas or where conditions are less than ideal — shrubs or ground covers are better choices for these areas.
Turf Grass Madness: Reasons to Reduce the Lawn in Your Landscape
Less Lawn, More Life