I grow in 6 raised beds. I use a 3 year rotation. 2 bed for legumes, 2 beds for nightshade, 2 beds for cucurbits. Each year I add a 3 inch layer of compost and mix it in with the older soil before planting. In the fall, I do my best to remove any old plant material at clean up time. I had fusarium issues at my old house. I've been growing here since 2012 with no fusarium, so far. Hope I didn't just jinx myself!