|The Psidium genus has several species commonly known as guava. Guava is a evergreen to semi-evergreen tropical, edible fruit used in jams, jellies, juices. Once Psidium is established, it does quite well with very little water. Plant in full sun where there is little to no danger of frost, in rich soil. The leaves of Psidium are glossy green and about 3 inches long. Fruit is red to black, when ripe, and has a mild, but tart taste.