I have NOT used any brassica planting in the same plot for more than a season or two. This year the plots I have in brassicas will be planted in something else. I may try opening a new brassica planting deeper in the woods as I have one more location I'd like to start a plot. Generally if I have the perfect PH and growing conditions than I'll opt for something else other than brassicas. I have just found that it's an awesome starter plot for many newly planted areas or darker more shaded spots.