To garden on a slope, use a staggered planting placement and build terraces so that plants have level space to grow on. Look for signs of erosion, and choose plants that grow well on slopes such as the Virginia creeper, the memorial rose and the Siberian carpet cypress.
Gardening on a slope requires first identifying the level of erosion on the slope. Signs of erosion include exposed tree roots, rocks on the surface of the dirt, small gullies and a build-up of silt in low areas. If the slope exhibits multiple signs of erosion, build terraces for the plants to grow on. Staircase the terraces up the slope to hold the plants level and prevent erosion.
Plant ground cover such as ivy, phlox and ornamental grasses to control erosion. Use mulch in the slope garden as this helps hold water. Avoid rounded types of mulch that roll down the slope as well as light mulch that may blow away in the wind. Do not plant in typical rows or lines; instead use staggered placements of plants to help stop water from running downhill.
Consider the angle of the sun on the slope to choose appropriate plants for each part of the garden. Slopes facing the east are warmer in the morning and cooler at night while slopes facing the west are cooler in the morning and warmer at night.