The correct answer is 6 x 6 m. Guava (Psidium guajava) is one of the important commercial fruit in India. It is native to Tropical America and it was introduced in 17th century. Standard spacing is 6 x 6 m. accommodating 112 plants/acre. High density planting causes erect growth of branches making the plant tall, compact and also gives higher yield/unit area in early years of fruiting.