The Ultimate Plant Spacing Chart for Vegetable Gardens

Every vegetable seed packet prints two spacing numbers, and most gardeners glance at them without really using them. This chart-style reference breaks down what those numbers mean, how to convert them into an actual plant count for your bed, and where the commonly cited ranges come from, so you're not just copying a number but understanding the math underneath it.

Reading a Spacing Number Correctly

"Space 18 inches apart" refers to the distance between the centers of two mature plants, sized so their canopies just touch or slightly overlap at full growth. It has nothing to do with how far apart the seeds or seedlings look when first planted. Planting tomato seedlings 8 inches apart because that's how much space the young plants seem to need ignores that they'll eventually need 24 to 36 inches once fully grown and fighting each other for light will already have set back your yield weeks before you notice.

The Core Spacing Reference

Leafy greens like lettuce and spinach: 6 to 10 inches. Bush beans: 4 to 6 inches in-row, 18 inches between rows. Pole beans: 6 inches in-row, 30 to 36 inches between rows for the trellis. Carrots and radishes: 2 to 3 inches. Beets: 3 to 4 inches. Broccoli and cabbage: 15 to 18 inches. Peppers: 14 to 18 inches. Tomatoes: 18 to 36 inches depending on whether they're determinate or sprawling indeterminate types. Squash and pumpkins: 24 to 48 inches, since their vines need serious room. Cucumbers: 12 inches if trellised, 36 inches if left to sprawl.

From Chart Number to Plant Count

Plant count for a bed equals bed area divided by the area each plant occupies. For a 4-by-8 bed, that's 32 square feet. Broccoli at 18-inch spacing occupies 1.5 feet times 1.5 feet, or 2.25 square feet per plant. 32 divided by 2.25 equals 14.2, so the bed holds 14 broccoli plants. Compare that to carrots at 3-inch spacing: 0.25 feet times 0.25 feet equals 0.0625 square feet per plant, and 32 divided by 0.0625 equals 512 carrots in the same footprint.

Row Spacing vs. In-Row Spacing

Row spacing (the gap between rows) and in-row spacing (the gap within a row) solve different problems. Row spacing is mostly about airflow and access for weeding or harvesting; tightening it too much invites fungal disease from poor air circulation. In-row spacing is about direct competition for light and root space between neighboring plants of the same row. A common mistake is tightening row spacing to fit more plants while leaving in-row spacing generous, when the reverse usually preserves yield better, since airflow problems tend to hurt an entire bed while a few tightly spaced plants in a row only affect each other.

Intensive vs. Traditional Layouts

Traditional row gardening, designed for tractor and hoe access, wastes a lot of space on wide row gaps — often 30 to 36 inches between rows regardless of crop size. Intensive square-foot-style planting drops row spacing down to the plant's actual light-competition radius, often 12 to 18 inches, since hand access replaces equipment access. This shift alone can raise plant counts 30 to 50 percent on identical square footage. A traditional 4-by-8 bed of bush beans at 18-inch rows might hold 3 rows of 24 plants (72 total); an intensive layout at 12-inch rows can fit 4 rows of 24, or 96 plants, a 33 percent increase.

When the Packet Gives a Range

Many packets list a range, like "space 12 to 18 inches apart." The tighter end maximizes plant count and total yield per square foot but reduces the size and yield of each individual plant. The wider end does the opposite: fewer, larger plants with bigger individual yields. Choose the tight end if you're growing for volume or preserving, and the wide end if you want fewer, higher-quality specimens, like show-garden tomatoes or oversized winter squash.

The Chart, in Five Lines

• Spacing numbers on seed packets represent mature plant width, not seedling size — plan for the plant it becomes.
• Plant count per bed equals bed area divided by the square footage each plant needs at maturity.
• Row spacing and in-row spacing are two separate numbers that solve two separate problems: airflow and light competition.
• Intensive spacing (square-foot-style) can raise plant counts 30 to 50 percent over traditional row spacing on the same footprint.
• When packets give a range, like 12 to 18 inches, the tighter end trades yield-per-plant for yield-per-area.

A spacing chart is really a set of area-per-plant constants waiting to be divided into your bed's square footage. The chart gives you the inputs; the division is the same formula every time.