Neem is Azadirachta indica, a mahogany-family tree whose bitter leaves, twigs and seed oil have been part of Indian yards, fields and bathrooms for a very long time. It is a plant with real chemistry and real risks. It is not a gentle “herb tea” in every form.
- Botanical name
- Azadirachta indica A.Juss.
- Family
- Meliaceae
- Tamil
- Vembu
- Hindi
- Neem
- Sanskrit
- Nimba
- Parts used
- Leaves, Seed oil, Bark, Twigs
- Habit
- Tree of wet to seasonally dry tropics; native from Assam to Indo-China, now widely planted
- Last updated
- 2026-10-24
How to recognise Neem
A. Jussieu published Azadirachta indica in 1830–31. The older Linnaean Melia azedarach is a different tree (Persian lilac, bakain) that people still confuse with neem when both are called “bead tree.”
Neem is a tree: pinnate leaves, toothed leaflets, small white flowers in panicles, and yellow-green drupes whose seeds are pressed for oil. The taste of a chewed leaflet is persistently bitter. That bitterness is a field clue, not a proof of purity in a bottle of oil.
Kew gives a native range from Assam to Indo-China and lists a long set of uses: medicine, food, fuel, poison, animal food, environmental planting. In Tamil Nadu the street tree called vembu is usually this species. A tree that drops yellow fruit on a dry avenue in May is a better field mark than a brown bottle labelled neem oil.
Seed oil (sometimes sold as “margosa oil”) is brown-green and garlic-like. It is not cooking oil. Leaf powder, twig datun and oil are three different preparations.
Traditional use of Neem
Ayurveda
Nimba is classically a bitter, cooling plant used on skin and in internal bitter formulae. Traditional use includes hygiene (twigs) as well as pharmacy. Those are historical categories.
Ayurvedic materia medica headings
South Indian household and farm use
Leaves go into stored grain, into baths after certain rituals, and onto fields as a crude pest deterrent. Farmers have used neem because insects dislike it, not because a trial proved a human disease claim.
Household and agricultural practice
Modern notes on Neem
Azadirachtin and related limonoids are well-studied as insect antifeedants. That agricultural chemistry is stronger than most of the human-supplement literature.
Human use of leaf or oil for skin and oral hygiene is traditional and still common. That does not make neem oil safe to swallow, especially for children.
Kew’s “poison” use flag is a reminder: a plant can be useful and hazardous in the same sentence.
Neem safety
Do not give neem oil by mouth, especially to infants. Serious poisoning has been reported.
Seed cake and oil can harm non-target animals. This is a farm chemical as much as a folk plant.
People who are pregnant or trying to conceive should not take internal neem preparations without specialist advice; some traditional uses were explicitly antifertility-related.
Ecology and sourcing
Neem is planted for shade, windbreak and municipal avenues across dry India. It is not a rare forest endemic. The sustainability question is usually about honest oil pressing, not about extinction.
Related plants
Also in Meliaceae
Questions about Neem
What is the botanical name of neem?
Azadirachta indica A.Juss., family Meliaceae. It is not Melia azedarach.
Is vembu the same as neem?
Vembu is the common Tamil name for Azadirachta indica.
Sources
- Azadirachta indica A.Juss. — Plants of the World Online, Kew (accessed 2026)
- Wikidata item Q170461 (Azadirachta indica)
Educational page about a plant. It is not medical advice, not a diagnosis, and not an offer to sell. Traditional use is historical. If you need care, ask a licensed clinician. Questions: hello@meevamed.com.