I was reading with great interest this article at Clean Air Gardening to plant feverfew as a natural way to repel insects, when it occurred to me to check what plants I may already have as possible deterrents to the pests that plague my asian greens. I noticed that our green perilla stands proud as a peacock with not a blemish from hungry insects. Why is that? Perilla - imho - has an odd smell. Its scent reminds me of sour...bread starter that has gone from a good sour to being just plain stink. At one point I even declared that it reminded me of my husband's armpits after a long morning of toiling away in the garden. I didn't really mean that of course; it was a rash statement! To this day when I stick my nose in the plant for a deep whiff, my olfactory senses do a short circuit and I am left confused. Perhaps that in itself is the answer. The last thing a bug needs is to be bewildered before a meal.