They sold me milkweed but I never got to see it bloom because of these insects. They don't use pesticides on their milkweed so you can feed it immediately to your hungry bugs. Sterile environments are for medical labs. Yes, some plants may have aphids wash them off or crush them I promise you will be rewarded with bees, birds, and if you are super lucky these littles. If you wouldn't feed it to your pets or kids, don't put it on your plant.