Steve, the thread title made me smile, because I grow my assorted onion varieties from seed in long trays, and put some hanging baskets of petunias from the rafters over the trays. So some seed falls down and I too get baby petunias amongst the onions.

I dunno if I mentioned this before, but 10-odd years ago, I had some hybrid "wave" variety of petunias in those baskets, and tried to grow out some of the offspring. So there were all sorts of varieties of petunia - leaf differences, blooming differences, flower size differences, growth habit differences.

I've kept one variety that has huge, deep purple blossoms, stems that when you pinch them, they shoot out 4 or 6 new stems, so one plant will easily fill up a 12" hanging basket, looking spectacular. I propagate if from cuttings, and get a dozen baskets to hang around the place every summer.

I'm gonna patent it, sell it to Monsanto, make a fortune and retire to the Caribbean.