Agenda 21 recommends developing processes to increase the availability of planting materials, particularly indigenous varieties, for use in afforestation and reforestation and to improve sustainable yields from forests.
In Costa Rica communities request not only fruit bearing trees and woodlots, but also for trees for shade and live fences. In Mexico, latex bearing trees are popular for making chewing gum. In Africa, any fruit tree or market-producing tree is welcome and in Asia, communities ask not only for trees, but shrubs and bamboo, as well.