I also use 6-24-24 purchased from my local COOP. I spread it ~6 weeks before bloom season, and again in fall. If I am reconditioning a bed, I will use compost, sand, peat moss, and some 6-24-24. My beds keep getting raised higher and higher, and now are about 12-15 inches above grade. I use landscape timbers to edge the beds, which also gives me something to sit on while weeding and for replanting.
