Guavas are common tropical fruits cultivated and enjoyed in many tropical and subtropical regions. Psidium guajava is a small tree in the myrtle family, native to Mexico, Central America, and northern South America.Guava fruits, usually 4 to 12 centimetres (1.6 to 4.7 in) long, are round or oval depending on the species.They have a pronounced and typical fragrance, similar to lemon rind but less sharp. The outer skin may be rough, often with a bitter taste, or soft and sweet. Varying between species, the skin can be any thickness, is usually green before maturity, but becomes yellow, maroon, or green when ripe. The pulp inside may be sweet or sour and off-white to deep pink. The seeds in the central pulp vary in number and hardness, depending on species.