Do not plant flowers or shrubs closer than 5 feet from foundations built on expansive soils. If the swell characteristics of soil are minimal, if the risk of planting is deemed acceptable, and if soil treatments during construction allow for planting, then choose plants with very low water requirements. For greater moisture control, water by hand. Limit watering to the minimum needed to maintain the landscaping. Ground cover plants may be acceptable, and sometimes more desirable than bare soil.
Ground covers reduce moisture fluctuations and minimize soil movement from the shrink-swell cycle.
Ground covers with low water requirements are the best plants for areas near foundations on expansive soils. Plant trees at least 15 feet away from foundations on expansive soils. Tree roots draw moisture from soils, causing shrinking and swelling. The amount of moisture drawn out of the soil depends on the tree species, size and location. If trees are planted well away from foundations in irrigated areas, the chances of foundation damage are minimal.