Square Foot Gardening: Spacing for Small Beds
Square foot gardening turns a small bed into a grid of 1-foot squares and plants each square at exactly the density its crop can handle. No rows, no wasted paths inside the bed — just a simple spacing rule that tells you how many of everything fits.
Divide the bed into 1-foot squares and plant each square according to the crop’s mature size: 1 plant per square for large crops (tomatoes, peppers, broccoli), 4 for medium (lettuce, basil), 9 for small (bush beans, spinach, beets), and 16 for tiny (carrots, radishes, spring onions). A 4×4-foot bed gives 16 squares — and keep beds no wider than 4 feet so every square stays within arm’s reach.
The spacing rule: 1, 4, 9, 16
The whole method rests on one idea: a plant needs a circle of soil roughly as wide as its mature spread. In a 12-inch square, that works out to four neat densities:
1 per square (12-inch spacing) — one plant takes the whole square. 4 per square (6-inch spacing) — divide the square into quarters. 9 per square (4-inch spacing) — a 3×3 grid. 16 per square (3-inch spacing) — a 4×4 grid of the smallest crops.
Choose by mature size, not by how big the seedling looks today. A broccoli transplant looks lonely at one per square in May; by July it owns the square completely.
Square foot spacing chart
| Plants per square | Spacing | Crops |
|---|---|---|
| 1 | 12 inches | Tomatoes (staked), peppers, broccoli, cabbage, cauliflower, aubergine |
| 4 | 6 inches | Lettuce, basil, Swiss chard, parsley, marigolds |
| 9 | 4 inches | Bush beans, spinach, beets, garlic, peas |
| 16 | 3 inches | Carrots, radishes, spring onions, rocket |
These densities match extension-published spacings for intensive beds — the grid is just a friendlier way to apply them.
How many plants fit your bed
Total plants = number of 1-ft squares × plants per squareCount your squares (length × width in feet), then multiply. A 4×8-foot bed has 32 squares. Dedicate 8 squares to carrots at 16 per square and you will harvest about 128 carrots from a 4×8 patch. Give 4 squares to lettuce at 4 per square for 16 heads. The table shows what a bed holds if every square grew lettuce at 4 per square:
| Bed size | Squares | Lettuce heads (4/square) |
|---|---|---|
| 3 × 3 ft | 9 | 36 |
| 4 × 4 ft | 16 | 64 |
| 4 × 8 ft | 32 | 128 |
| 2 × 8 ft | 16 | 64 |
Laying out the grid
You do not need anything fancy. Stretch string across the bed every 12 inches and pin it, lay thin wooden laths on the soil, or simply mark the grid with the back of a rake. Permanent laths are nicest — they survive watering and give you planting lines for years.
Keep beds 4 feet wide at most (2 feet if you can only reach from one side, e.g. against a fence) and leave 2–3 feet of path between beds for a wheelbarrow. Fill the bed at least 6 inches deep — 8 to 12 inches is better for root crops.
What doesn’t fit square-foot spacing
Most crops adapt, but a few refuse: sweetcorn needs a block at least 4×4 feet for pollination, not single squares; sprawling winter squash and pumpkins want 15+ square feet each — trellis them vertically or give them their own patch; perennial crops like asparagus and rhubarb deserve permanent beds; and tall trellised crops (pole beans, cucumbers) belong on the north edge at 1–2 per square so they don’t shade the rest.
Plan the plants, then fill the bed
Once your spacing plan is set, work out exactly how much soil the bed needs — no more guessing at the garden centre.
Frequently asked questions
Does square foot gardening really grow more food?
Per square foot, yes — eliminating in-bed paths means nearly 100% of the bed grows crops instead of 60–70% in row gardening. The trade-off is that dense plantings need rich soil and consistent water, since many roots share little soil.
Can I use square foot spacing in containers?
Absolutely. A 12-inch pot is roughly one square: grow 1 pepper, 4 lettuces, 9 spinach plants, or 16 radishes in it. Use the same densities and a quality potting mix.
How do vining plants work on the grid?
Grow them up, not out. Put a trellis on the north side of the bed and plant pole beans or cucumbers at 2 per square along it. You keep the floor space and gain a vertical wall of harvest.
How deep should a square foot bed be?
Six inches is the working minimum for salads and herbs; 8–12 inches suits almost everything, including carrots and parsnips. Open-bottom beds placed on decent soil effectively gain extra depth from the ground below.
Related guides
How Much Soil Do I Need for a Raised Bed?
Turn your bed dimensions into cubic feet and bag counts.
Easiest Vegetables to Grow for Beginners
Pick forgiving crops for your first square-foot grid.
How to Grow Tomatoes in a Raised Bed
One tomato per square — here is how to make it count.