Leucaena

Fast-growing nitrogen-fixing tree ideal for permaculture systems, windbreaks, living fences, and alley cropping. Excellent pioneer species for degraded land restoration, providing quick shade and biomass. Self-seeds readily, making it useful for reforestation but requiring management in some contexts.

Traditional medicine uses include treating intestinal worms, contraception, and diabetes management. Seeds contain mimosine which can be toxic in large quantities. Bark used for internal parasites and dysentery. Young shoots applied to wounds. Should be used with caution due to mimosine content.

Young pods, seeds, and leaf tips edible when cooked properly. Seeds require soaking and cooking to reduce mimosine. Young pods eaten like green beans in Southeast Asian cuisine. Sprouted seeds used in Indonesian and Thai dishes. Leaves used as vegetable but consumption should be limited due to mimosine.

Aggressive nitrogen-fixer improving soil fertility significantly. Deep taproot mines nutrients and breaks up compacted soils. Produces allelopathic compounds that may inhibit some plants. Provides habitat for birds and insects. Can become invasive in tropical regions, forming dense monocultures that exclude native vegetation.

Small to medium tree 5-20m tall with bipinnate leaves, 4-9 pairs of pinnae each with 11-22 pairs of leaflets. White globular flower heads in clusters. Distinctive flat brown pods 10-25cm long containing 15-30 seeds. Bark grey-brown, smooth when young becoming fissured. Mimosa-like foliage folds at night.

Wood moderately hard and heavy (specific gravity 0.5-0.6), used for light construction, posts, and fuel. Excellent firewood with high calorific value. Pulpwood potential for paper production. Not durable for ground contact without treatment. Poles useful for temporary structures and agricultural supports.

Known as 'miracle tree' for its rapid growth - can reach 5m in one year. Name derives from Greek 'leukos' meaning white, referring to flowers. Called 'ipil-ipil' in Philippines. Can produce 20-60 tons of biomass per hectare annually. Leaves contain more protein than alfalfa, making valuable livestock feed when processed correctly.