Arlene, somewhere I have an article about herbs in the flower garden, I think it's here, I'll see if I can find it because it also works for vegetable gardens. But -- off the top of my head I can think of these:
*All lemon scented plants repel lots of insects
*Castor bean is good for repelling underground things including moles and voles
*Basil deters white flies
*Clovers are great for repelling aphids
*Dill repels just about everything
*fennel - same as dill
*garlic - same thing
*oregano, rosemary, and thyme - same
So that's the short list and most of these, especially things like clover, I keep in pots that are placed around and about in the garden. Sometimes I bury the pots, leaving just the rim above ground. The pots keep them from spreading, particularly things like mint and that's another one that needs to be added to the list.
The size of my vegetable garden is dwindling now, so it's nothing like yours, but what I've listed works for me and though sometimes I have an infestation of something, not often. I hope this helps.
I'll see if I can find that other article, forgot the name of it.
