Neem

Neem is direct-sown and grows in full sun or partial shade, thriving in deep, permeable, sandy soils across sub-arid to sub-humid tropical and subtropical regions. It is hardy only to about USDA zone 10, needs little supplemental water once established, and grows quickly, shedding its leaves during dry periods as a drought-deciduous tree.

The tree's olive-like drupes mature roughly 12 weeks after flowering, turning from green to golden yellow as they ripen between June and August.

Culinary: Tender young shoots of neem are used as a traditional food in India.

Medicinal: Various parts of neem have long featured in traditional Ayurvedic, Unani, and Chinese medicine, particularly across the Indian subcontinent, where practitioners have used it in preparations intended for the prevention and treatment of a range of ailments.

Industrial: Neem seed oil yields azadirachtin, a compound extracted commercially to make botanical insecticides that disrupt insect growth and feeding, while the remaining clarified oil is formulated into sprays used against aphids, whiteflies, spider mites, caterpillars, thrips, and other pests, as well as fungal problems such as powdery mildew, by blocking spore germination. Beyond pest control, neem oil and its derivatives are also used in cosmetics, soaps, repellents, lubricants, resins, and gums.

Ornamental: In its native range across southern Asia, neem is planted widely as a shade tree, its wood is used for cabinetry, and the tree carries religious and cultural significance in parts of South Asia.

Neem originates in the tropical and subtropical forests of southern India, with its native range also touching Pakistan, Bangladesh, and Nepal. From this South Asian base the tree has long been cultivated throughout India, Malaysia, and Pakistan, and its drought tolerance allowed it to spread into more arid regions of Iran, the Middle East, and western Sub-Saharan Africa; introduced plantings elsewhere, including Australia, Ghana, Kenya, Fiji, and Puerto Rico, have since escaped cultivation and become naturalized.