Square foot gardening is a way of growing vegetables in a small space by dividing a bed into a grid of one-foot squares — roughly 30 cm by 30 cm — and planting each square with a set number of plants. It was developed as a response to the traditional row garden, which wastes space on paths between wide rows and is hard to manage in a small garden. A square-foot bed is compact, easy to plan, easy to reach, and surprisingly productive, because every square is used and nothing is wasted on paths. This guide explains how to plan a square-foot bed, what to plant in each square, and how to keep it productive.
The idea is simple, and that is its strength. A bed 1.2 metres by 1.2 metres — four feet by four feet — divides into sixteen squares. Each square holds a certain number of plants depending on the size of the crop: one large plant such as a tomato or a pepper, four medium plants such as lettuce or chard, nine smaller plants such as bush beans or beets, or sixteen small plants such as carrots or radishes. You plant only what you need, you know exactly how many plants fit, and you can see at a glance what is growing where. It is a system that suits beginners, because the plan is clear, and it suits small gardens, because it wastes no space.
Planning a square-foot bed
Start with a raised bed, because square-foot gardening was designed for raised beds, and a raised bed gives you the loose, rich soil the system needs. A bed 1.2 metres square and 15 to 30 cm deep is the classic size: you can reach the middle from any side without stepping on it, and it divides neatly into sixteen squares. Our raised bed gardening guide covers building the bed, and the raised bed soil mix guide covers the mix to fill it with. Mark the grid with string, laths or canes laid across the bed, so you can see the squares clearly. The square foot garden planner will help you plan a bed and work out how many plants fit in each square.
Fill the bed with a loose, rich mix. The classic square-foot mix is roughly equal parts compost, peat-free coir or similar material, and a coarse drainage material such as perlite or vermiculite, but a mix of topsoil and compost also works well if it is loose and rich. Do not fill a square-foot bed with heavy garden soil: it compacts, it drains badly, and the close planting the system relies on will fail. Water the bed well before planting, and let it settle. Plan the bed on paper before you plant: put tall plants on the north side, so they do not shade the plants behind them, put fast crops where you can reach them easily, and leave a square or two for succession sowing, so you can sow again when a crop is finished. Our succession planting guide pairs naturally with square-foot gardening, because the grid makes it easy to see which square is free.
Spacing: how many plants per square
Spacing is the heart of square-foot gardening, and the numbers are general, not exact — they vary with variety, soil and climate, so treat them as a starting point and adjust as you learn. As a general guide: one per square for large plants such as tomatoes, peppers, aubergines, broccoli, cabbage and squash, though squash and other sprawling plants may need more than one square, or a trellis to grow up. Four per square for medium plants such as lettuce, chard, kale, bush beans and herbs such as basil. Nine per square for smaller plants such as beets, turnips, bush peas and spinach. Sixteen per square for small plants such as carrots, radishes, spring onions and garlic. Our plant spacing calculator will work out spacing for beds and rows, and the growing lettuce, growing carrots and growing tomatoes guides cover the crops themselves.
Do not be tempted to squeeze in more plants than the grid allows. Overcrowded plants compete for light, water and food, they grow weak and leggy, and disease spreads fast in still, damp air. A square with the right number of healthy plants will out-yield a square with twice as many crowded ones. Thin seedlings to the right number as soon as they are large enough to handle, and do not leave thinning until the plants are competing. If you are unsure about spacing for a particular crop in your area, check your local extension service for advice.
Soil, watering and feeding
Square-foot beds need good soil, because they are planted intensively and the soil is worked hard. Top up the bed each year with a layer of compost, and add a trowelful of compost to each square when you replant it, so every crop starts in rich soil. Do not dig the bed over: the system relies on the soil staying loose and uncompacted, and digging destroys the structure. Add compost to the surface and let worms pull it down, which is the same principle as no-dig gardening.
Watering needs care, because a closely planted bed dries out fast and the plants are competing for water. Water the soil, not the leaves, water thoroughly so it reaches the roots, and mulch the surface to hold moisture. A drip system or a soaker hose laid under mulch is ideal for a square-foot bed, because it waters the soil evenly without wetting the leaves. The watering calculator gives a starting point. Feed with a balanced liquid feed through the season for hungry crops, and stop feeding in autumn and winter. Our fertilizing vegetables guide covers feeding in detail. In winter, mulch empty squares or sow a cover crop, so the soil is protected; our winter soil preparation guide covers winter bed care.
Succession and rotation in a square-foot bed
A square-foot bed is at its best when it is never empty. As soon as a square is harvested, replant it with something else: a fast salad after early peas, a late crop of spinach after summer lettuce, a winter green after a summer crop. This is succession planting, and the grid makes it easy, because you can see exactly which square is free and what it held before. Our succession planting guide covers the timing. Rotate crops from year to year, so the same family does not grow in the same square — keep a simple plan on paper, and note what each square grew, so you can rotate properly next year. Do not grow the same crop in the same square twice in a row, because soil-borne disease builds up.
Interplanting — growing a fast crop between slow ones — works well in a square-foot bed. Radishes sown between slow-growing carrots are ready before the carrots need the space. Lettuce grown under a tomato plant uses the shade and is picked before the tomato needs the room. But do not interplant so much that the bed becomes overcrowded: the grid is a plan, not a suggestion, and a square that holds too many plants will grow none of them well.
Pros and cons of square-foot gardening
The advantages are clear: it uses space efficiently, it is easy to plan and manage, it is easy to reach every plant without stepping on the soil, it wastes no space on paths, and it is productive for its size. The disadvantages are real too: it needs good, rich soil and regular feeding, because the soil is worked hard; it needs regular watering, because closely planted beds dry out fast; it suits vegetables and herbs better than large, sprawling plants, which may need more than one square or a trellis; and it can become overcrowded if you are greedy with the spacing. It is a system that rewards discipline and punishes optimism.
Common mistakes
The most common mistake is overcrowding — planting more than the grid allows, so plants compete and disease spreads. The second is poor soil: filling the bed with heavy garden soil instead of a loose, rich mix. The third is forgetting to feed, so the soil runs out of food mid-season. The fourth is underwatering, because closely planted beds dry out fast. The fifth is putting tall plants on the south side, where they shade everything behind them. The sixth is leaving squares empty after harvest, instead of succession sowing. And the seventh is not rotating crops, so disease builds up in the same squares year after year. If you are unsure about planning or spacing for your area, check your local extension service for advice.
Frequently asked questions
How many plants fit in one square foot?
It depends on the size of the plant. As a general guide: one large plant such as a tomato or cabbage, four medium plants such as lettuce or chard, nine smaller plants such as beets or bush beans, and sixteen small plants such as carrots or radishes. These are starting points, not exact rules — adjust for variety, soil and climate.
What size bed is best for square-foot gardening?
A bed 1.2 metres square, 15 to 30 cm deep, is the classic size. You can reach the middle from any side without stepping on it, and it divides neatly into sixteen squares. Longer beds work too, as long as you can reach the middle from either side.
What soil should I use in a square-foot bed?
A loose, rich mix — roughly equal parts compost, a peat-free material such as coir, and a drainage material such as perlite or vermiculite, or a mix of topsoil and compost. Do not use heavy garden soil, which compacts and drains badly.
Can I grow tomatoes in a square-foot garden?
Yes, one tomato per square, with a strong stake or trellis, and plenty of water and food. Sprawling plants such as squash may need more than one square, or a trellis to grow up. Put tall plants on the north side so they do not shade the plants behind them.
How do I keep a square-foot bed productive all year?
Succession sow: replant each square as soon as it is harvested, rotate crops from year to year, top up with compost when you replant, and use the grid to see which square is free. In winter, mulch empty squares or sow a cover crop.