DOn't waste your time if you have clay soils, I tried it on a clay spot that had a bit of sand but not enough, three years of hope till I gave up on it and turned it under. you NEED a clean seed bed, I'm talking weed free, kill plot in late summer, kill it again three weeks later, again three weeks later. Plant winter rye, on green up in spring kill that and wait, light till, wait, spray, maybe do buckwheat summer, burn it down, light till and spray again. by this time there should be little to no competition for the sainfoin. seed it and cross fingers. mine never got more than a foot high, might have ended up with 10% coverage, not enough there to see if the deer even ate it or not. I could not manage the area, and after further reading my soils were wrong. expensive seed, three years wasted, I moved on.