What is square foot gardening?
Square foot gardening (SFG) is a method of intensive planting developed by Mel Bartholomew in 1981. Instead of growing vegetables in long rows — a technique designed for large farms and tractors — you divide your garden into a grid of 1-foot squares and plant each square according to how much space that crop actually needs.
The result: you grow significantly more food in a fraction of the space, with far less weeding, watering, and wasted effort. A single 4×4 foot raised bed can hold up to 16 different crops at once.
Why it works so well for raised beds: Raised beds are already built for intensive planting. The soil is loose, deep, and rich — so roots grow down instead of out. Plants can be spaced much more closely than in traditional row gardens, which also means fewer weeds and more consistent moisture.
How to set up your square foot garden
You don't need special equipment. The basic setup takes an afternoon and works in any raised bed or in-ground plot.
Choose your bed size
The most common size is 4×4 feet. This allows you to reach every square from the edges without stepping on the soil. You can go longer (4×8, 4×12) but never wider than 4 feet — the rule is that you should always be able to reach the center from either side.
Fill with the right soil
Bartholomew's original recipe — known as Mel's Mix — is ⅓ compost, ⅓ peat moss (or coconut coir), and ⅓ coarse vermiculite. It's light, drains well, and is full of nutrients. Avoid using regular garden soil in raised beds — it compacts and drains poorly.
Add the grid
The grid is what makes the whole system work. Lay laths, strings, or wooden slats across your bed in a 1-foot pattern. This visual guide is what lets you keep track of which square holds which crop and prevents overcrowding.
Plan before you plant
This is the most important step and the one most beginners skip. Map out which crop goes in which square before buying seeds. Consider sun, height (taller plants to the north), companion planting, and succession planting. A digital garden planner makes this far easier than pencil and paper.
The square foot gardening spacing chart
The core rule of SFG is simple: the number of plants per square depends on the plant's spacing requirement. If a plant needs 6 inches of spacing, you can fit 4 per square foot. If it needs 3 inches, you fit 16. If it needs 12 inches, you plant just 1.
Here is the complete spacing chart for the most common vegetables, herbs, and fruits:
| Plant | Plants per sq ft | Spacing | Notes |
|---|---|---|---|
| Radishes | 16 | 3 in | Fast harvest, great for succession |
| Carrots | 16 | 3 in | Need deep, loose soil |
| Onions | 16 | 3 in | Use sets for faster results |
| Spinach | 9 | 4 in | Bolt-resistant in part shade |
| Beets | 9 | 4 in | Thin to strongest seedling |
| Bush beans | 9 | 4 in | No support needed |
| Peas | 8 | 4–6 in | Need trellis or support |
| Lettuce (leaf) | 4 | 6 in | Cut-and-come-again variety |
| Swiss chard | 4 | 6 in | Harvest outer leaves continuously |
| Kale | 1–2 | 12–18 in | Gets large, allow room |
| Basil (small) | 4 | 6 in | Pinch flowers to extend harvest |
| Basil (large) | 1 | 12 in | Gets very bushy |
| Parsley | 1 | 12 in | Biennial, comes back second year |
| Chives | 16 | 3 in | Perennial, divide every few years |
| Cilantro | 1 | 12 in | Sow successionally every 3 weeks |
| Dill | 4 | 6 in | Great companion for brassicas |
| Garlic | 9 | 4 in | Plant cloves tip-up in fall |
| Leeks | 9 | 4 in | Long season, start early indoors |
| Broccoli | 1 | 18 in | One plant per square |
| Cauliflower | 1 | 18 in | Blanch heads for white color |
| Cabbage | 1 | 18 in | Use netting to prevent moths |
| Pepper | 1 | 12 in | Start indoors 10–12 weeks before frost |
| Eggplant | 1 | 18 in | Loves heat, plant after soil warms |
| Tomato (bush) | 1 | 18–24 in | Use 1–2 sq ft per plant |
| Tomato (vining) | 1 per 4 sq ft | 24+ in | Needs cage or strong stake |
| Cucumber | 2 | 6 in | Train vertically to save space |
| Zucchini | 1 per 9 sq ft | 36 in | Gets enormous, plan space carefully |
| Winter squash | 1 per 2 sq ft | 24 in | Train vines out of the bed |
| Pumpkin | 1 per 2 sq ft | 24 in | Let vines roam outside the bed |
| Corn | 4 | 6 in | Plant in blocks, not rows, for pollination |
| Okra | 1 | 12 in | Harvest when small for tenderness |
| Strawberry | 4 | 6 in | Remove runners to focus energy |
| Marigold | 4 | 6 in | Excellent pest deterrent, plant throughout |
How to lay out a 4×4 raised bed
A standard 4×4 bed gives you 16 squares to work with. Here's a sample layout designed for a productive beginner garden:
Sample 4×4 layout. Place taller plants (tomatoes, cucumbers) on the north side so they don't shade smaller crops.
Common square foot gardening mistakes
Planting too many large crops
One zucchini plant takes up to 9 square feet once fully grown. Two zucchinis in a 4×4 bed would dominate your entire garden. Plan for scale — one is usually enough for a family, and you can always add more beds later.
Ignoring sun direction
In the Northern Hemisphere, taller plants go on the north side of the bed. Tomatoes, cucumbers on a trellis, and corn should never shade the shorter crops next to them. Always sketch your layout with the sun in mind before you plant.
Skipping succession planting
Once a fast-maturing crop like radishes or lettuce is harvested, that square is empty. Succession planting means having a new seedling ready to drop in immediately. This doubles or triples the yield from the same space over a season.
Not planning on paper (or digitally) first
The biggest mistake is just walking to the garden center, buying whatever looks good, and figuring out placement later. You end up with too many large plants, bad companion combinations, and wasted squares. Plan the whole bed first — it takes 20 minutes and saves months of frustration.
Plan your square foot garden visually: Niwa is a free iPhone app built specifically for square foot gardening. It draws the grid for you, shows how many plants fit in each square, and gives you a personalized planting calendar based on your local frost dates. Download it free →
Succession planting for continuous harvests
The real power of square foot gardening shows up when you plan for succession. Instead of planting all your lettuce at once and getting overwhelmed, plant one square every two to three weeks. As you harvest the first square, the next one is catching up.
Good crops for succession planting include: radishes (harvest in 25–30 days), lettuce, spinach, cilantro, bush beans, and beets. Every time a square empties, it's an opportunity to plant something new — even a completely different crop from what was there before.
Crop rotation in raised beds
Even in a small raised bed, rotating crops matters. Tomatoes and other nightshades (peppers, eggplant) should not go in the same square two years in a row — they deplete specific nutrients and can harbor disease. A simple rule: divide your crops into families (nightshades, brassicas, roots, legumes) and rotate each family to a different square or bed each season.
Square foot gardening vs traditional row gardening
| Feature | Square foot gardening | Traditional rows |
|---|---|---|
| Space efficiency | High — 80% growing surface | Low — 20% growing, 80% paths |
| Watering | Less — dense canopy retains moisture | More — large open areas dry faster |
| Weeding | Minimal — plants crowd out weeds | Significant — open rows invite weeds |
| Setup cost | Higher — raised bed + soil mix | Lower — use existing ground |
| Best for | Small spaces, beginners, raised beds | Large plots, farm-scale growing |
Getting started this season
Square foot gardening is the best method for anyone with a small yard, a single raised bed, or a desire to grow more food with less effort. The learning curve is minimal — the spacing chart does most of the work for you.
The key is to plan before you plant. Sketch your grid, assign each square a crop, check the spacing numbers, and account for sun direction and companion planting. Once you've done it once, it becomes second nature.
If you want to skip the pencil-and-paper planning, Niwa does it all on your iPhone — the grid, the spacing, the planting calendar — completely free.
