The Vigoroot 20L pots are suitable for a wide variety of herbs, flowers and shrubs as well as young trees, fruit trees and bushes, exotics and vegetables. At the end of the growing season they can be washed in cold water, thoroughly dried, folded away and stored for the following year. The magic of Vigoroot fabric comes from its ability to air-prune the roots of plants, dramatically changing their formation and their ability to sustain the plant in a limited volume of compost. It encourages more vigorous rooting, which enables the plants to absorb more nutrients. It prevents the roots from growing too long, and helps prevent plants from becoming pot-bound which would normally limit the plants growth. This means that the plants can grow to a much larger size in a relatively small pot. The super strong root system also helps the plants to become more resistant to harsh weather, pests and diseases.