It may sound extreme, but i grow some rare hot peppers that start indoors in the winter under grow lights. They became infested with spider mites.. i tried every spray you can think of but they always came back. What i ended up doing, was filling a large tub with 10% bleach water, and completely submerging my plants for an hr or so.. it worked. I recently had a purple sweet potato vine INFESTED with caterpillers, and even BT wasnt helping. I submerged that plant as well and the issue was solved.. there were thousands of tiny caterpillers floating in that bucket as they release from the plant to come to the surface. So far, none of the plants that i have used this method on have been harmed. Obviously large plants cant really use this method, unless you have a swimming pool
