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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.
The best planting depth for bulbs is generally three times the size of the bulb. For oriental lilies, 6-inches is a good depth. Asiatics can be planted 4 to 5 inches deep. Adding some bulb food or bone meal gives them some phosphorus to start. Interplant the ferns and lilies by planting them in an alternating pattern 10 inches apart.