Neem oil is a heavy oil that coats the surface of leaves, creating a semi-permeable barrier. If you are dealing with a pest outbreak on a tree, horticultural oil specifically labeled for trees is a better option.
Plants Sensitive to Neem Oil and Phytotoxicity Risks
Derived from the seeds of the neem tree, it works by disrupting the life cycle of pests and inhibiting fungal growth. Specific Tree Concerns Japanese Maple Norway Maple Silver Maple It is generally best to avoid spraying neem oil on any maple species.
The Science Behind Neem Oil Sensitivity Before identifying specific offenders, it helps to understand why neem oil affects some plants differently than others. Specific Herbs to Avoid Basil Cilantro (Coriander) Dill Parsley Chives These herbs have a high respiration rate on their leaf surfaces and a sensitivity to oils that can cause severe stress.
Phytotoxic Plants List: Neem Oil Sensitivity in Herbs and Trees
Herbs with Delicate Cellular Structures Many culinary herbs have thin, fragile leaves that cannot handle the heavy oil load neem imposes. Neem oil is celebrated in organic gardening for its versatility as an insecticide, fungicide, and miticide.
More About What plants not to use neem oil on
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