I am definitely trying as many of these as I can- I love the idea. Had marigolds growing all through the veggies last year. Not sure how much good it did- but they sure looked pretty! Going to try the radishes too...Thanks for the info!
I've done the radish thing, before, and they get BIG and WOODY with super deep roots, and then, they get nasty tops--generally they become nuisance BEHEMOTHS!! I'm NOT doing it again.
Already threw marigold seeds in one of my beds this year--I like them!