The Oasis Zone (zone 1) where the more water-intensive plants are used is the area up close to the house where the landscape is most visible and accessible to the home's interior and entryways.
- Use hardy garden perennials, non-xeric groundcovers, ornamental grasses, small ornamental trees, annuals, container gardens, water features.
- Water harvesting from roof areas and hard surfaces is most easily done here.
- Vegetable gardens are considered oasis plantings (but do not need to be located next to the house).
The Transition Zone (zone 2) where water-wise xeric plants are used in areas that occupy the middle ground of the property especially along walkways, driveways, fences and other areas that are visible as you approach the house.
The Xeric Zone (zone 3), where only very xeric plants exist, is the outermost area along the property boundary and includes any out-of-the-way areas that are not used or seen much.
Note: Many homeowners who are not gardeners, or who prefer xeric plants, opt to forego an oasis zone. You can bring the Transition Zone (zone 2) right up to the house. This gives a landscaped look, while providing additional watering savings.
Step 2: Use Native Grasses For Turf Areas
For optimum water savings, use native grasses such as turf-type Buffalo Grass and Blue Grama grass whenever possible in the Western US. These are excellent drought-tolerant alternatives to thirsty Kentucky Blue Grass and other turf-type grasses. Where possible, you can skip mowing, to allow the ornamental seed heads of the grasses to add movement and texture to the landscape. In areas where you'll walk or play, opt for a low-growing waterwise lawn. Learn more about our Sustainable Lawns.
Herbaceous and woody groundcovers are excellent low maintenance, low-water lawn alternatives. These work especially well on hillsides, along walkways, and in areas where you'd like to see more color and texture.
Step 3: Use Plants Matched To Your Regional Conditions
Use plants that are a good match for your region's growing conditions. Both native and adapted plants (plants from other continents) need to be suitable for your soil pH, soil type, precipitation levels, and climate. When browsing for plants on our site, use the shopping filters to find plants that are suited to your unique growing conditions.
Remember to match plants and microclimates, as well: for example, buildings, walls, topography, and mature trees all create small areas with differing microclimates. Some areas may be especially hot and dry, while others may be cooler and more moist. Pick your plants accordingly.
- Xeric plants should be used for hot, dry south- and west-facing areas.
- Mesic plants (plants that prefer more moisture) should be used in moister areas along north- and east-facing slopes and walls.
- Don't mix plants with high and low watering needs in the same planting area.
4. Create Healthy, Living Soil
The key to any successful xeriscape is healthy, living soil. When planting a garden at a new home, where the topsoil has been removed or badly damaged by disturbance and compaction, living soil must be started from scratch. On established sites with good soil, soil health simply needs to be maintained. This is accomplished by:
- Adding organic matter to the soil at planting time in the form of compost and/or organic fertilizers.
- Inoculating new transplants with beneficial mycorrhizal root organisms.
- Continuing to fertilize (feed the soil) regularly with compost and organic fertilizers. This supports a healthy microbial population needed in the soil to break down organic materials and release nutrients to the plants.
- Avoiding the use of synthetic insecticides and fungicides on the soil, which would harm the soil's web of life.
Learn more: Building Your Soil Health Naturally & Organically
Step 5: Use Mulches
Mulching is an essential gardening technique in arid regions, especially in the Western US. By covering the soil's surface with some type of mulch, you will:
- Help retain valuable soil moisture by shading the soil from the hot sun. Save water and irrigate established plants less frequently.
- Capture rainwater by allowing hard rains to soak into the soil instead of running off into the street and drainage areas.
- Reduce weed growth.
- Add organic matter to the soil gradually improving the soil from the top down.
- Moderate soil temperatures making for more optimum root growth conditions.
Step 6: Irrigate Efficiently
Even xeric perennials will need some water to establish. The best way to irrigate is to water deeply and less frequently. Why? Shallow, frequent irrigation encourages shallow root growth and thirsty plants. Less frequent, deep watering is preferred to frequent, shallow watering because it encourages root system growth. The result is plants that are more resilient and drought tolerant.
- Use soaker hoses and drip irrigation to apply water directly to the root zone.
- Know your soil type and understand how to best apply water to it. Sandy soils need different water schedules than clay soils.
- As trees grow, move drip emitters further away from the trunk to apply water at the drip line.
Step 7: Harvest Rain and Snow Runoff
Harvesting water from roofs, sidewalks, driveways, and other hard surfaces and directing it onto your landscape to be stored in the soil is a very practical way of supplementing irrigation water from your well or faucet.
If legal in your state, use rain barrels and cisterns to capture and hold water draining off roofs to water potted container gardens and vegetable gardens.
Step 8: Maintain Your Landscape and Garden Properly
A well-planned xeriscape planted with plants well matched to your region's conditions and climate will naturally be a low-maintenance type of garden. Whenever possible use organic products and techniques to create a balanced, healthy landscape in harmony with the environment.
Examples of xeric maintenance techniques include the following:
- Avoid the lush, thirsty plant growth that results from over-fertilizing with harsh chemical fertilizers; use organic composts and fertilizers applied in the fall instead.
- Apply more mulch in the fall after fertilizing.
- Don't prune your shrubs into unnaturally shaped boxes and balls, as this creates continuous high-frequency work for years to come.
- Keep your irrigation systems tuned and maintained at the start of each season.
- Don't cut back your perennials in the fall. Wait until early to mid-spring of the following year to improve winter cold hardiness of the plants and provide shelter for beneficial insects to over-winter.
For more xeriscape inspiration, see examples of customer gardens that feature High Country Gardens waterwise plants: Outstanding Customer Landscapes