My experience is that the brassicas grows faster than the clover on a freshly planted plot. I planted 2 acres of biologic prennial last year bot the clover and brassicas did very well. This April I hit the field very lightly with a disc just to get some opening in the ground and then put down Maximum to get the brassicas back. I have not had any brassicas come up this year. However, the clover is doing great and I think the brassicas may have just got chocked out by the clover.