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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.
Tomatoes, peppers, beans, squash and melons require 12 to 36 inches between plants. Potatoes, turnips and onions need 3 to 18 inches between plants. Space rows at least 24 inches apart. Melons and pumpkins should have at least 48 to 60 inches between rows. Keywords: vegetable plant spacing, growing healthy vegetables, types of vegetables.