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Square-foot gardening makes raised bed spacing simple: divide your bed into a 1×1 ft grid and plant 1, 4, 9, or 16 of each crop per square based on its mature size. Fewer variables, more food per square foot, and far fewer weeds.
Why raised beds let you plant closer
Traditional row gardening leaves wide aisles so you can walk between plants without compacting the soil. In a raised bed you never step inside the bed, so the soil stays loose and aerated all season. That means roots can push through more easily, nutrients stay evenly distributed, and you can pack plants tighter without the yield penalty you’d see in compacted ground.
A good soil mix for raised garden beds — typically one-third compost, one-third peat or coco coir, and one-third coarse perlite — is the reason the spacing math works. Fluff that mix before you plant and your roots will do the rest.
Rule of thumb: Raised bed spacing is roughly 25–30 percent tighter than the “between rows” number on a seed packet. Use the chart below instead of the back of the bag.
Square-foot spacing chart
The numbers below are standard square-foot gardening values. Each plant count assumes a 12×12 inch square.
| Crop | Plants per sq ft | Spacing within the square | Notes |
|---|---|---|---|
| Tomato | 1 | 1 per square | Cage or stake; needs airflow |
| Pepper | 1 | 1 per square | Same rule as tomatoes |
| Eggplant | 1 | 1 per square | Give a full square minimum |
| Broccoli | 1 | 1 per square | Heads need room to widen |
| Cabbage | 1 | 1 per square | Can crowd if heads are small |
| Cauliflower | 1 | 1 per square | Same as broccoli |
| Zucchini | 1 per 2 sq ft | 1 every 2 squares | Sprawling; consider trellis |
| Lettuce (head) | 4 | 2×2 pattern (~6 in) | Cut-and-come-again works well |
| Swiss chard | 4 | 2×2 pattern (~6 in) | Harvest outer stalks |
| Basil | 4 | 2×2 pattern (~6 in) | Great companion for tomatoes |
| Parsley | 4 | 2×2 pattern (~6 in) | Slow to establish |
| Bush beans | 9 | 3×3 pattern (~4 in) | Don’t thin — direct sow |
| Spinach | 9 | 3×3 pattern (~4 in) | Cool season; bolt in heat |
| Bush peas | 9 | 3×3 pattern (~4 in) | Trellis even dwarf types |
| Beets | 9 | 3×3 pattern (~4 in) | Thin so roots can size up |
| Turnips | 9 | 3×3 pattern (~4 in) | Harvest greens too |
| Carrots | 16 | 4×4 pattern (~3 in) | Must thin to final spacing |
| Radishes | 16 | 4×4 pattern (~3 in) | Ready in 25–30 days |
| Onions | 16 | 4×4 pattern (~3 in) | Good scallions at tight spacing |
| Garlic | 16 | 4×4 pattern (~3 in) | Plant cloves pointy end up |
Not sure how big your bed should be before you figure out how many squares you have to work with? The raised bed size calculator does the math — a 4×4 bed gives you 16 squares, a 4×8 gives 32.
How to use the grid
- Divide your bed into 1×1 ft squares. Garden string tied to small stakes works; so does a permanent lath grid resting on top.
- Pick one crop per square (or mix crops that mature at different times — see intensive planting below).
- Space evenly within the square: for 4 per square plant in a 2×2 pattern, for 9 a 3×3, for 16 a 4×4.
- Sow a few extras and thin. Drop two seeds per spot and snip the weaker seedling at the soil line once they sprout. Don’t pull — you’ll disturb neighbors.
- Replant immediately after harvest. A square that held radishes in May can go to beans in June. Check your planting calendar for succession timing.
Intensive planting tips
Tight spacing only works when your soil is genuinely rich. Before planting, add 1–2 inches of finished compost and water it in. During the season, side-dress heavy feeders like tomatoes and brassicas with compost every 4–6 weeks.
Mix fast and slow crops in the same square. Radishes mature in 25 days; plant them in the same row as carrots (which take 70–80 days). The radishes will be gone before the carrots need the space.
Stagger transplant dates. Instead of planting all your lettuce at once, start a new square every two weeks. You’ll harvest continuously rather than facing a glut.
Watch for airflow problems. Dense plantings limit air movement, which invites fungal disease — especially on tomatoes. Keep susceptible crops like peppers and basil at their proper spacing and don’t push them tighter just because there’s room on paper. See tips on growing tomatoes in raised beds for more on airflow and support.
Going vertical: trellis your climbers
Any crop that climbs can be placed at the north edge of the bed (or south edge in the Southern Hemisphere) so it doesn’t shade shorter plants. A simple cattle-panel arch or T-post trellis lets you grow these at standard square-foot density without sacrificing walkway space:
- Pole beans — 9 per square foot at the base of a vertical string or net
- Cucumbers — 2 per square foot trained up a trellis (vs. 1 per square sprawling on the ground)
- Indeterminate tomatoes — 1 per square with a 6-foot cage; don’t go tighter even with supports
- Sugar snap peas — 9 per square with a short trellis; dwarf types still need something to grab
Vertical growing is one of the biggest advantages a raised bed has over an in-ground plot. A 4×8 bed with a trellis on the north end effectively doubles its productive surface area.
Why spacing matters more than you think
- Too crowded → poor airflow, powdery mildew, stunted roots, and small harvests.
- Too sparse → wasted space and exposed soil that fills with weeds fast.
Square-foot spacing hits the sweet spot between yield and plant health. Pair it with companion planting for tomatoes (basil at 4 per sq ft next to your tomato square is a classic) and you’ll get the most out of every square.
Getting your bed depth right
Spacing is only half the equation. Shallow soil limits root depth and forces you to water constantly. Most vegetables need at least 8–12 inches of root zone; carrots and tomatoes want 12–18 inches. Before you worry about square-foot spacing, make sure your raised bed is deep enough to support the crops you’re planning.
New to raised beds entirely? The beginner’s guide to raised bed gardening covers everything from lumber selection to soil filling before you get to the spacing step.
Frequently asked questions
How far apart should I plant vegetables in a raised bed?
Use square-foot spacing: large plants like tomatoes and peppers get 1 per square foot, lettuce and basil 4, spinach and bush peas 9, and carrots, radishes, and onions up to 16 per square foot.
What is square foot gardening?
Square foot gardening divides a raised bed into a 1×1 ft grid and plants a set number of each crop per square based on its mature size. It maximizes yield in a small space and makes spacing simple.
How many tomatoes per square foot?
One. Tomatoes are large and need a full square foot each (with a cage), plus good airflow to prevent disease. Don't crowd them.
How many carrots can you grow in a square foot?
About 16 — they're small and grow well close together. Thin them as they sprout so the roots have room to size up properly.
Can you plant closer in a raised bed than in a traditional garden?
Yes. Raised beds have loose, well-amended soil with no compaction from foot traffic, so roots spread more easily. That lets you reduce spacing by about 25–30 percent compared to in-ground row spacing on many crops.
How close can you plant lettuce in a raised bed?
Four heads per square foot works well for most leaf lettuce. Space them in a 2×2 pattern within each square (about 6 inches apart). You can harvest outer leaves as they grow without pulling the whole plant.