Before planting a tree, a gardener needs to choose a good location—one with the right kind of soil, sufficient drainage, and enough light for the type of tree chosen. Then he or she must be sure to dig a deep enough hole. It should be deeper than the root-ball and about twice as wide. The gardener must unwrap the root-ball since the burlap, which is biodegradable, may be treated with chemicals that will eventually damage the roots if it is not removed. The roots may have grown into a compact ball if the tree has been in a pot for some time; they should be separated or cut apart. The gardener should set the root-ball into the hole and then begin to fill the hole with loose dirt. After filling the hole completely, he or she should make sure to water the tree thoroughly, since new plantings require extra water and extra care. After about three years they become well rooted.