Huh...I never knew that! So planting marigolds in the cinderblock holes when using cinderblocks for a square-foot garden is about more than just makin' the border purty? I hadn't realized. Purty is a definite bonus, though...
Yep. I guess insects don't like the smell. And at least some marigolds repel nematodes too.
Well the jury is out on how well marigolds actually 'repel' anything. They are strongly scented and the best read I can get is that they confuse the insects. I know that japanese beetles love the 'Flagstaff' variety (bonus points to anyone who knows why I just had to plant that variety - lol!) and it made it easier to pick them off and drown them in the coffee can of soapy water. But they left the peas alone.