Answer: July sounds late to plant beans, but perhaps your situation in Arizona dictates you wait that long. I would have thought you'd plant in April for a July harvest. Perhaps the July planting is for the fall crop? The 'Burpee's Best' is a nice bean foryour area. If your soil is on the poor side, definitely use the Burpee Booster for Beans. If your soil is very fertilie to start with, you won't need it.
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