In spring 2002 I planted two acres of Biologic perennial. The first to come up was the brassica seed and then the clover was slower to start. By August the brassica started to turn purple. At this point the deer went through and took all the tops off the brassica. I guess when it turns purple it must be ripe. Anyway some of it was knee high and they never bothered it until August. I am not sure about the other Biologic brands but that is my experience with the perennial. This spring the clover looks to be doing well and we plan to overseed the plot with the biologic maximum to replenish the brassica.