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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).
1 Evaluate how deep you want the mulch. 2  The amount of mulch you buy depends on how deep you want the mulch to be. 3  Most gardening experts recommend 2 to 3 inches (5.1 to 7.6 cm) over general soil, with 1 to 2 inches (2.5 to 5.1 cm) around vegetables, flowers and shrubs.etermine the amount of mulch to purchase. 1  Calculate the amount of mulch you need in cubic yards. 2  Bulk mulch is sold by the cubic yard, which is the measurement widely used in the gardening industry for mulch. 3  One cubic yard (27 cubic feet) will provide 1 inch of coverage over 324 square feet.