hornworms are not friends to the garden! we had them one year, a while back, and learned to companion plant with our nightshades. here is a start, we planted marigolds and borage:
borage flowers are very pretty and tasty in a fresh green salad, with a subtle cucumber flavor. borage is also very bee- friendly, so if you think the hawkmoth is a pollenator ( edit: they are not! if you want to share your crop) the addition of bee-friendly, hornworm aggressive borage flowers are a good thing and really helped with our peppers and eggplants.
eta: we shoild continue this discussion on the
gardening thread.