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In general for most vegetables you want at least 12 inches deep, for tomatoes and large squash 18 inches deep, for herbs and small flowers 8 inches deep. Longer and wider is always better because the soil stays more evenly moist (up to 8ft long x 4 ft wide for raised beds and 8ft long x 3 ft wide for boxes).
Planting depth should be set in the field during planting - not in the shop, based upon the owner's manual. Get the planter up to speed and check seeding depth 50' to 100' into the field. This is important because soil type, seedbed condition, moisture and planter speed will influence appropriate planting depth.