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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).
Okra should be transplanted at 3- to 4-leaf stage in double rows 15 to 18 inches apart and 12 inches between plants. If drip irrigation is used in conjunction with plastic mulch, the tube should be centered between the rows and buried approximately 2 to 3 inches deep.