The tough clay soil that is throughout the Mid-Atlantic region has loads of nutrients for plants to grow. The problem is that the soil can be compacted and impermeable and can allow more runoff than infiltration. Landis Garden Design specializes in the design and building of raingardens. These depression gardens, which are about two feet deep and surrounded with a six inch high (min.) berm, are filled with a special raingarden soil mixture for permeability. Home downspouts, directed into the garden, fill the raingarden and allow the runoff to pond and then infiltrate. Specialized native plants are selected for their adaptability to this brief inundation and all raingardens are designed to completely drain within 48 hours.