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Deep rooted plants such as tomatoes, zucchini, corn, and perennial fruits and vegetables, do best in planters at least 22 inches tall, or shorter if the ground below is usable.
This depends on how tall your sprinklers are. For most 4 inch pop-ups you will need to dig trenches about 9 inches deep at the sprinklers. To know for sure how deep to dig, assemble a sprinkler on a fitting and measure the height from the bottom of the fitting to the top of the sprinkler.