Neem oil is a type of vegetable oil extracted from the fruits and seeds of the neem tree (Azadirachtaindica), a fast-growing evergreen tree that is native to the Indian subcontinent. With a large variety of different uses, neem oil is an extremely versatile substance that carries beneficial medicinal, cosmetic and gardening uses. To use, mix 1 tsp (capful) per quart of water and stir well. Shake well before each use. To clean and ship your plant leaves, spray liberally on both sides of leaves and stems. One application will leave a healthy luster to your plant leaves.