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Square Foot Gardening for Beginners: Grid, Spacing Chart and a 4×4 Plan
The grid method that removes spacing guesswork; plants-per-square chart for 30 crops.
Updated 2026-09-11
The idea
Divide the bed into 1×1 ft squares with string or thin lath. Each square holds a set number of plants based on spacing. No rows, no wasted paths, far less thinning.
The method works because it converts the spacing on a seed packet into a number you can count. "Thin to 3 in apart" means 16 per square; "6 in apart" means 4; "12 in apart" means 1. The grid does the planning for you.
Plants per square
- 1 per square: tomato, pepper, eggplant, broccoli, cabbage, kale, zucchini (give it 2 squares), cucumber on a trellis
- 4 per square: lettuce, chard, basil, parsley, marigold, strawberries
- 9 per square: bush beans, spinach, beets, turnips, peas (on a trellis)
- 16 per square: carrots, radishes, scallions, onions from sets
| Spacing on the packet | Per square | Examples |
|---|---|---|
| 12 in | 1 | tomato, pepper, eggplant, broccoli, cabbage, kale, potato |
| 6 in | 4 | lettuce, chard, basil, parsley, kohlrabi, corn, marigold |
| 4 in | 9 | bush beans, spinach, beets, turnips, peas, bok choy, leeks |
| 3 in | 16 | carrots, radishes, scallions, onion sets, garlic (fall) |
| 2 squares | 1 | zucchini, summer squash, bush cucumber, determinate tomato in a cage |
| 4 squares | 1 | winter squash, melon on a trellis, indeterminate tomato without pruning |
Building the grid
Screw thin lath or bamboo across the bed at 1 ft intervals, or run string between nails. A visible grid is the point: without it, the bed drifts back into rows by June. A 4×4 bed is 16 squares; a 4×8 is 32. Keep beds 4 ft wide so every square is within reach.
Soil mix (the classic)
One third compost (blend several kinds), one third peat or coir, one third coarse vermiculite. It is expensive to fill a deep bed this way; use it for the top 6 in over a cheaper base.
The numbers: a 4×4 bed 6 in deep holds 8 cu ft, so about 2.7 cu ft each of compost, peat or coir and vermiculite, roughly $60–80 in bags. A 4×8 at 6 in is 16 cu ft and about $130. For a 12–17 in raised bed, fill the base with the standard 60/30/10 raised bed soil mix and use the classic mix only for the top 6 in, or skip it altogether; the grid works in any good bed soil.
4×4 starter plan
North row: tomato, cucumber (trellis), pepper, basil. Second row: 4 lettuce, 4 chard, 9 beans, 9 spinach. Third row: 16 carrots, 16 radishes, 4 parsley, 9 beets. South row: 16 scallions, 4 marigolds, 4 strawberries, 9 peas on the fence.
That is 16 squares, about 110 plants, and it feeds two people salads, beans and roots from May to frost, with the tomato and cucumber on top. More copy-and-plant beds with counts in the layout plans.
Vertical crops
Tomatoes, cucumbers, pole beans and peas go up a trellis on the north edge of the bed. A 4 ft wide panel or netting on two posts takes 4 squares of climbers that would otherwise sprawl over 16. Tall crops on the north side matters more here than anywhere: shade costs whole squares.
Watering
Square-foot beds are densely planted and the classic mix drains fast, so they dry out sooner than a conventional bed. Water at the base of the plants, not over the leaves, and mulch open squares. A drip line down every second grid row is the easiest way to keep 16 squares evenly moist.
Succession
When a square is harvested, replant it the same week: radishes → beans → lettuce → garlic across one season. Use the planting calendar for the dates.
A single square carries three crops a year in zones 5–7 and four in zones 8–10. Keep a few transplants growing in cells so an empty square is refilled the day it is cleared.
Zone notes
- Zones 3–5: skip the pepper and eggplant squares or start them indoors in March; use the space for a second cucumber and more beans.
- Zones 6–7: the starter plan as written; the peas and spinach come out in June and their squares take beans and chard.
- Zones 8–10: run the salad squares from October to April and fill the summer squares with okra, sweet potato and bush beans.
Mistakes to skip
- Two tomatoes in adjacent squares without a trellis. They need pruning to a single stem to fit 1 per square.
- Skipping the visible grid.
- Filling a 17 in bed with the classic mix. Base first, mix on top.
- Sowing all 16 radish squares at once. Four squares every two weeks.
- Planting the trellis on the south edge.
FAQ
How many tomato plants per square foot?
One, pruned to one or two stems and tied to a trellis. A caged, unpruned tomato needs 2 squares; an indeterminate plant left alone takes 4.
How deep does a square foot garden need to be?
6 in of the classic mix is enough for greens, beans, herbs and radishes. Carrots, potatoes and tomatoes do better with 12 in. Most people simply use the grid in a 12–17 in raised bed.
Does square foot gardening work in the ground?
Yes. Mark the grid on a dug and composted bed and use the same counts. The only difference is drainage and the soil you start with.
How many plants fit in a 4×4 square foot garden?
Around 100–130 with a mix of 1, 4, 9 and 16 counts. The starter plan above holds about 110 plants plus a tomato and a cucumber.
Is square foot gardening worth it for beginners?
Yes. It removes spacing and thinning guesswork and makes succession obvious. Skip the expensive mix if you already have a deep bed; keep the grid.
What I'd buy first
Vego Garden 17" Tall 9-in-1 Modular Metal Raised Bed
Modular galvanized bed, 17 in tall (deep enough for root crops), 9 layouts from one kit. The bed I'd start with if I only bought one.
Check price via Vego GardenBotanical Interests Beginner Vegetable Seed Collection
Beginner-proof varieties (bush beans, zucchini, lettuce, radish, cherry tomato) with the best planting instructions on the packet.
Check price via Botanical Interests
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