Same here. 3-4 inches. I've trenched and used the mound method. Then a couple years to save space i built 3 3x3ft simple raised beds, 2x12 board, filled one as the 'planter' and as the plants grew i added another 3x3 on top and filled around plants, re-peat. Just went up with it. Really good production in a small space. You can plant a bit thick in a raised tower bed.
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