The best ratio for this DIY plant spray is one part neem oil to 133,000 parts water, or a teaspoon and a half of neem oil to one quart of water. View Article Sources. Pascoli, ...

Mixing your own neem oil spray for plants is straightforward. Plus, it offers more control over strength and additional ingredients. Follow the steps below to blend and apply your bug-busting mixture.

Neem oil is a natural pesticide that is recommended for many plant problems. But how safe is neem oil, really, and when can you use it? We explain how to use it on your plants.