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We would not bother. A neem leaf wash is a cosmetic wash for foliage you look at closely: houseplants, conservatory plants and ornamentals in pots. It lifts dust and leaves a sheen. Vegetables are grown to be eaten, not looked at, and there is nothing a leaf wash does for a row of carrots or a bed of brassicas that is worth the time.
Ourons sells the wash, and the pure oil it is made from, for houseplants and ornamentals. If you want to give a vegetable bed something from the neem tree, the product for that is neem cake: the pressed seed residue, used as a slow organic fertiliser that is forked into the soil.
Where the wash does earn its keep
- Glossy-leaved houseplants: rubber plants, monstera, philodendron, peace lily.
- Bay, olive and citrus in pots, which pick up a grey film indoors and in town gardens.
- Orchids and other broad-leaved plants kept on a windowsill.
Recipe and rates: how to make a neem leaf-shine spray.