Non-Toxic Weed-n-Feed
Non-Toxic, All organic Weed-n-Feed is corn glutton based.
It does not kill plants that have already sprouted. It does stop weed seeds from sprouting. The University of Iowa has data detailing how many weed seeds it keeps from sprouting and that list is about 80% of the known area weeds.
It can be used 2 ways-
Put it down first on bare ground, then put in seedling plants. Or, put your seeds to sprout (row crops) in bare soil and once they sprout, do a light weeding and put down the corn glutton.