The problem I had untill I just decided it wasn't worth the trouble. I couldn't tell the weeds from wheat or some possible hybrid untill they had grown a good bit. So I'd go off to macerate something, ect and come back to find they destroyed the seeds I'd just spent the last 6 hours devoloping and effectivly sending me halfway back to the start of my seed devolopment. Weeds are just vicious and not easy enough to spot imho. I felt like a swarm of paid my home a visit after the experience and chose to just leave it alone untill it's refined a bit.