I first discovered neem oil in 2012 , and since then I have found more and more uses for it. Even though this isn’t actually a herb that I grow (yet!), but it’s a herbal product that I think you should know about, so I’m including it in this series on the herbs that I grow and use . My original post about neem oil is particularly popular at the moment and I thought it was time for an update. In that first post I had only tried neem oil in an insect repellent, but it turns out that there are many other ways to use neem. Here’s what I wrote last time about how neem works: Unlike most chemical insecticides that kill by contact with the insect, neem oil works by disrupting the insects’ hormones, so they must ingest the neem oil to be affected. This means that it only affects insects that bite or chew, and is safe for bees and spiders (and, unfortunately, fruit flies), unless they become coated in the oil. As the neem oil affects the hormones, only small amounts are required for inse