Beds can be constructed of brick edging, masonry or rot-resistant timbers and filled with soil previously combined with organic matter and nutrients. Low mounds of soil without edging can add several inches of desirable soil. See Figure 3. Examples of raised beds for clays and other soils of poor structure. Soil for containers Planters, patio wells, tubs and pots have their own soil needs.
Excellent drainage is essential.
Good drainage means that watering must be done frequently. All containers should have drain holes. Soil amendment materials Many kinds of materials are available for soil improvement. Thorough blending of these amendments with the soil is very important. Plant roots may not cross a boundary between distinctly different types or textures of soils or soil amendment materials.