US Patent 7726070 Hydration maintenance apparatus and method

A material for maintaining hydration in plants, whether potted or in natural soils may include a substrate treated with a binder, securing a layer of hydrating particles thereto. Typical binders may include lignicite, or other naturally occurring materials such as sugars, molasses, corn syrup, gelatin, or the like. A byproduct of wood, lignicite has been found to be very effective. Various materials can serve as a hydrating, particulate coating. Polyacrylamide has been found to serve well and provide relief from the stress of dehydration that normally occurs in plants between waterings.