Neem oil
/nim ɔɪl/
Definition
Neem oil is a plant-derived oil pressed mainly from the seeds of the neem tree, Azadirachta indica. In gardening, it refers to a horticultural oil used on plants to help manage certain insect pests and some fungal diseases. Its distinguishing feature is that it contains naturally occurring compounds, especially azadirachtin, which can disrupt insect feeding and development, unlike dormant or mineral oils that work mainly by coating pests.
Use in Gardening
- Broad-spectrum contact coverage: It is used on many houseplants and garden crops to help manage soft-bodied pests such as aphids, whiteflies, mealybugs, and spider mites by coating exposed bodies and feeding sites.
- Best fit for integrated pest management: It works best as one tool in a broader routine that includes inspection, pruning, washing foliage, and repeat treatment, since eggs, hidden insects, and heavy infestations may escape a single application.
- Application timing matters: Sprays are usually applied in cooler parts of the day and not on drought-stressed plants, because wet leaves in strong sun or heat are more likely to show leaf burn or spotting.
- Coverage and plant sensitivity: Leaf undersides and stem joints need thorough coverage, but some plants with delicate, fuzzy, or waxy foliage can react poorly, so a small test area is useful before wider use.
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