Guavas (singular guava are common tropical fruits cultivated and enjoyed in many tropical and subtropical regions.Psidium guajava (common guava, lemon guava) is a small tree in the Myrtle family (Myrtaceae), native to Mexico, Central America, and northern South America. Although related species may also be called guavas, they actually belong to other genera, such as the "strawberry guava" Acca sellowiana. Owing to its hardy nature, guava is grown successfully in tropical and subtropical regions up to 1,500 m above mean sea-level. Best quality guavas are obtained where low night temperatures (10 °C) prevail during winter. It tolerates high temperatures and drought conditions in North India during summers but it is susceptible to severe frost as it can kill the young plants. An annual rainfall of about 100 centimetres (39 in) is sufficient during the rainy season (July- September). The rains during harvesting period, however, deteriorate the quality of fruits. Guava is cultivated on varied types of soils- heavy clay to very light sandy soils. Nevertheless, very good quality guavas are produced in river-basins. It tolerates a soil pH of 4.5-8.2. Maximum concentration of its feeding roots is available up to 25 cm soil depth. Thus the top soil should be quite rich to provide enough nutrients for accelerating new growth which bears fruits. guava Its fruits are medium-sized and pink colored. They are sweet in taste with good keeping quality. They require low temperature for the development of good pink color. The trees are of medium vigour but their leaves are greener than others. However, it is a moderate yielder.
Guava is a very popular fruit. It is available throughout the year except during the summer season. Being very hardy, it gives an assured crop even with very little care. Its cost of production is also low because its requirements for fertilizer, irrigation and plant protection are not much. Further its nutritive value is very high. Therefore, it is and ideal fruit for the nutritional security. Guava is also grown as a backyard fruit to great extent.