Designing gardens for sloping yards can be a challenge. Because hillsides are subject to erosion, a design must be sure to stabilize the soil. A well thought out garden design can help prevent soil runoff.
Most hillsides can be made relatively stable with plants, even shallow rooted groundcovers, such as ajuga and lily-of-the-valley are effective in preventing topsoil erosion. Plantings on a hillside should be diverse with a mix of groundcovers, shrubs, trees, and perennials. Utilizing a diverse mix of plants creates layers of vegetation which will help reduce the force of rainfall hitting the ground.
Proper planting technique is essential when planting a hillside. The best solution to planting a successful hillside garden is to create terraced planting areas help prevent runoff and allows rainfall to seep into the soil.
To create a terrace, dig straight into the slope at a 90 degree angle. The soil which is removed can be spread around the downward part of the slope creating a larger terrace in which to plant. A retaining wall of boulders and large stones may be required to hold the soil above the terrace in place. Creating this flat planting area makes planting easier and watering more efficient.
Large trees and shrubs that are planted in the hillside garden will need a well constructed around their base. They’ll hold water and should be as wide as the tree’s canopy.
The direction the slope is facing can determine which plants are appropriate for your garden. South and west facing slopes receive more sun and are prone to dry conditions. Slopes which face north or east receive less sun and subject to wetter soil.
Another solution a sloping yard is to create a rock garden. Rocks placed on the slope can prevent erosion and add interest to the hillside. Pockets of soil can be created by the rocks for planting perennials and shrubs.
Consider using soaker hoses, which slowly release water into the soil, for irrigating hillside gardens. Avoid drastic re-grading around existing trees and shrubs as exposing a plant’s roots or building up around its trunk with soil is potentially harmful. When planting a hillside garden start at the top and work your way down the slope. Its easier and better for the plants as they are less likely to be steeped on.
With thoughtful planning and design a sloping yard can be transformed into a stable and beautiful hillside garden.
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