Subabul is now widely spread throughout the tropical and subtropical countries of the world.
It is a perennial hardy evergreen shrub. It has deep and strong taproot and even the seedlings are deep rooted. The leaves are bipinnate, 15 to 20 cm long with 10 to 15 pairs of pinnate leaves. Inflorescence is globular and the flowers are white. There are four types of subabul.
It can grow under a wide range of conditions as a range plant, roadside plant, in pastures etc. The land should, however, be cleared of bushes, ploughed and levelled before sowing.
A basal application of N:P2O5:K2O @ 20:50:30 kg ha-1 is recommended.
Since the early growth of the crop is slow, the tender plants are to be protected from aggressive weeds. Two or three inter-row cultivation is essential to check weeds in early life. Once established, even vigorous grasses seldom smother the plants.
Leucaena combines well with many grasses like guinea, pangola, dinanath, Hybrid Napier etc.