How Much Space Do Vegetable Plants Need in a Garden?

Plan rows according to space requirements before planting vegetables.

Plants need room to grow, and adequate spacing must be considered when planning a vegetable garden. Depending on variety, vegetables need anywhere from a few inches to a few feet of space to accommodate growth above and below ground level.

Purpose

Proper spacing reduces competition among plants for water and nutrients. When spaced appropriately, each plant will have access to the resources it needs without taking them away from others.

Plant Spacing

When planting from seed, sow seeds at the intervals recommended on the seed packet. When seedlings emerge, they may be thinned to the required spacing. For example, broccoli, cauliflower, peppers and watermelon should be thinned to ensure 18 to 24 inches of space between plants. Peas, lettuce, spinach and carrots may grow closer together, requiring only 2 to 3 inches on each side. Tomatoes require 24 to 36 inches of space, depending on the mature height of the variety.

Row Spacing

Row spacing is important to vegetable growth and the gardener's ability to work comfortably in the garden. Plan rows 24 to 30 inches apart for broccoli, cauliflower and peppers. Most types of peas, lettuce, spinach and carrots need about 12 inches between rows, but some varieties require as little as 6 inches of separation. Tomatoes require rows spaced 24 to 48 inches apart. Watermelon vines' tendency to sprawl demands more space, so plan for 60 to 84 inches between rows.

Considerations

Squash, cucumbers and some melons may be trained to grow upright on a trellis, which will conserve space by keeping the plants off the ground. Wide rows with diagonal thinning and planting in 1-square-foot sections offer additional ways to maximize space in a small vegetable garden.

References

• Iowa State University Extension: Planting a Home Vegetable Garden