Plant 4 full-size bok choy per square foot, or 9 baby bok choy per square, in a square foot garden.
That works out to about 6 inches between standard plants and 4 inches between baby plants, which gives each head enough room to fill out without crowding its neighbors.
Bok choy (Brassica rapa subsp. chinensis) is one of the fastest crops you can put in a grid.
Baby leaves are ready in about 30 days, and full heads finish in 45 to 60. It bolts quickly in heat and long days, though, so timing and spacing decide whether you get crisp stalks or a bitter flower stalk.
How Many Bok Choy Plants Fit in One Square Foot?
Four standard plants or nine baby plants fit in one square, and the count you pick should match the size you plan to harvest. Before you sow, grab a packet of bok choy seeds and check the mature width.
Keep a piece of row cover nearby too, since flea beetles find young brassicas fast.
Four Plants for Standard Bok Choy
Full-size bok choy needs about 6 inches of plant spacing. In a 12-inch square, that gives you a 2 x 2 pattern:
- Divide the square into four smaller boxes about 6 inches wide.
- Put one plant in the center of each box, roughly 3 inches in from the grid lines.
- Expect leaves to touch at maturity. Touching is fine; heavy overlap invites rot and pests.
Larger types like ‘Joi Choi’ reach 8 to 12 inches across. If your packet lists a mature width over 12 inches, drop to 2 plants per square.
Nine Plants for a Baby Bok Choy Harvest
Baby bok choy grows well at 4-inch spacing, which gives you a 3 x 3 pattern of nine plants. Compact varieties such as ‘Toy Choy’ stay about 5 inches tall and wide, so they fit this grid easily.
My advice is to plant nine and harvest in stages. Pull every other plant whole when they’re young, then let the remaining plants size up. You get an early harvest and a longer picking window from the same square.
Which Bok Choy Varieties Work Best in a Small Bed?
Compact, slow-bolting varieties are my top picks for a square foot bed. They fit the grid, mature fast, and hold longer before flowering.
Choose a Size That Matches Your Harvest Plans
Growing bok choy in a grid starts with picking a size. You’ll see seed packets labeled bok choy, pak choi, or Chinese cabbage. Napa cabbage is a different heading type that needs a full square, so read the packet carefully.
| Type | Example varieties | Plants per square | Days to harvest |
|---|---|---|---|
| Baby / dwarf | ‘Toy Choy’, ‘Mei Qing Choi’ | 9 | 30 to 40 |
| Standard | ‘Joi Choi’, ‘White Stem’ | 4 | 45 to 60 |
| Extra-large | Tall full-size types | 1 to 2 | 55 to 70 |
If you want quick salads and stir-fries every week, go with baby bok choy. If you want thick white stalks for cooking, choose a standard variety.
Look for Slow-Bolting Varieties in Spring
Spring crops face warming temperatures and lengthening days, the two main bolting triggers. For spring sowings, I’d pick varieties sold as slow-bolting or heat-tolerant, such as ‘Joi Choi’, ‘Mei Qing Choi’, ‘Win-Win Choi’, or ‘Black Summer’.
Fall crops grow into shorter, cooler days, so almost any variety does well then. That makes fall the best season to try a new type.
When Should You Plant Bok Choy?
Plant bok choy in early spring and again in late summer so it matures in cool weather, ideally between about 45 and 75°F. Each garden has its own frost dates, so count backward from yours using the days to maturity on the packet.
Plant in Early Spring Without Exposing Young Plants to a Long Cold Spell
Direct sow 2 to 4 weeks before your last frost date, or start seeds indoors under grow lights 3 to 4 weeks ahead. Young bok choy handles a light frost, but several cold nights in the seedling stage can push it to bolt later.
I’d wait to set out transplants until nights stay above about 50°F. If a hard cold snap shows up after planting, cover the square with row cover until it passes.
In the Southeast and Southwest, spring warms so fast that I’d lean on fall and winter crops instead.
Sow Again in Late Summer for a Fall Harvest
Fall is the easiest season for bok choy in most of the US. Count back about 6 to 8 weeks from your first frost date and sow then. In the Northeast and Midwest, that usually lands in late July or August.
Fall bok choy tolerates light frost, and the flavor sweetens in cool weather. In mild-winter areas like the Gulf Coast, the low desert, and much of California, you can keep sowing from September into winter.
Use Afternoon Shade When Temperatures Climb
Once days pass about 75 to 80°F, bok choy gets stressed and starts to bolt. A 30 to 40% shade cloth stretched over the square from noon on lowers leaf temperature and buys you extra days.
This trick helps most with late-summer sowings and late spring crops.
Prepare the Bed and Soil Before Planting
A loose, compost-rich mix in a gridded raised bed gives bok choy the steady moisture and fertility it needs to grow fast. Good soil preparation also cuts down on the stress that leads to bolting.
Set Up the One-Foot Grid and Accessible Paths
The classic layout for square foot gardening is a 4 x 4-foot raised bed divided into sixteen 1-foot squares. Here’s how I’d set it up:
- Keep the bed no wider than 4 feet so you can reach the center from either side.
- Mark the grid with thin wood strips, string, or twine so the squares stay visible.
- Leave 2 to 3 feet of path between beds so you never step on the mix.
- Put the bed where it gets at least 6 hours of sun in spring and fall.
Fill the Bed with a Loose, Compost-Rich Mix
Bok choy has shallow roots, so 6 inches of mix is enough. The traditional square foot gardening soil mix uses equal thirds by volume of blended compost, peat moss or coco coir, and coarse vermiculite.
This mix drains fast, stays fluffy, and never needs tilling. The compost supplies organic matter and slow nutrients, which leafy greens use quickly. If you’re reusing an older bed, work a trowel or two of fresh compost into each bok choy square before planting.
How to Sow Seeds or Set Out Transplants
Bok choy seeds go in shallow, and transplants go in young and level with the soil. Both methods work well in a grid, and direct sowing avoids transplant shock.
Sow Seeds at the Right Depth and Thin Seedlings
Follow these steps for each square:
- Poke holes 1/4 to 1/2 inch deep with a pencil or chopstick at each planting spot (4 or 9 per square).
- Drop 2 or 3 seeds in each hole.
- Cover lightly with mix and water gently.
- Keep the surface moist every day until sprouts appear, usually in 4 to 10 days.
- When seedlings are about 2 inches tall, snip all but the strongest one in each hole with scissors.
Snipping keeps you from disturbing the roots of the seedling you’re keeping. The thinnings make a nice microgreen snack.
Harden Off and Transplant Without Burying the Crown
For growing bok choy from transplants, use young seedlings with 3 to 4 true leaves, usually 3 to 4 weeks old. Older, rootbound starts are more likely to bolt once they hit the garden.
Set seedlings outside for a few hours a day over about a week to harden them off. Then plant each one at the same depth it grew in the cell.
Keep the crown, where the leaves meet the roots, at the soil surface so it doesn’t rot. Water well right after planting.
Arrange Bok Choy and Its Neighbors in the Grid
Bok choy is low and leafy, so it needs no support and fits near the edges or front of a bed. The main layout job is keeping it out of the shade of tall crops in warm weather.
For more pairing ideas, see my guide to companion planting in square foot gardening.
Leave Room for Leaves Without Adding Plant Supports
Bok choy grows as an upright rosette with sturdy stalks, so you won’t need stakes, cages, or a trellis. What it does need is breathing room inside its square. Stick to 4 or 9 plants per square and don’t squeeze in extras.
Once a week, check for lower leaves lying on the mix. Pick those off and eat them. Leaves on wet soil attract slugs and hold moisture that leads to rot.
Keep Tall Crops to the North and Pair Nearby Squares Wisely
Put tall crops and trellises on the north side of the bed so they don’t shade the rest. Bok choy works well on the south and middle rows.
In late summer, though, a