These are problems people actually ran into growing bok choy at home, in their own words. Each answer starts with the answer. Everything here is organic — compost and homemade feeds instead of chemical fertiliser, and no synthetic pesticide — and assumes a pot on a balcony, patio or windowsill rather than a field.
If your daytime temperatures are staying above 25°C, yes — it’s too hot to plant bok choy now. Bok choy is a cool-season leafy green that grows best between 5°C and 25°C. When the weather is hotter, the plant bolts (runs to flower) and the leaves turn bitter. Warm soil also stops seeds from germinating.
Check the forecast. If highs are below 25°C for the next couple of weeks, plant immediately. If not, wait for a cooler spell, or sow seeds indoors on a bright windowsill and move the pot outside only when temperatures drop.
If you do plant now, give each plant a 4-liter pot. Place it where it gets no more than 5 hours of morning sun, then shade for the rest of the day. Keep the soil evenly moist — water when the top inch feels dry. A mulch of compost on the surface keeps roots cool. Seeds should sprout in about 7 days, and you can harvest in about 45. If a heatwave strikes, move the pot into full shade until it passes.
Your potted bok choy is overcrowded because you sowed multiple seeds close together and didn’t thin the seedlings, so several plants are crammed into one pot. Each seed grows into a full leafy plant, and bok choy needs room to spread its leaves and form a proper base. Without space, plants stay small, stretch upward, and compete for light and nutrients.
Fix it now: water the soil first, then snip the weaker seedlings at soil level with scissors, leaving just one strong plant every few inches. You can also gently transplant the extras into their own 4-liter pots filled with compost-rich soil, but disturb the roots as little as possible. Keep the pot where it gets about 5 hours of sun. Feed every couple of weeks with diluted homemade compost tea or a liquid seaweed feed. You’ll be able to harvest leaves in around 45 days. Next time, sow only two or three seeds per pot and thin to one after they sprout.
Those translucent holes are slug or snail damage, and they aren’t healing — the eaten patches stay thin and can break open. The plant won’t repair the old leaves, but new growth will look fine once you remove the pests. Check after sunset with a torch, especially on the undersides of leaves and along the pot rim.
To stop the damage: handpick any slugs, snails, or caterpillars and drop them into soapy water. Lay a small board or a folded piece of damp cardboard on the soil overnight; the pests hide under it, and you can remove and dispose of them in the morning. Put a ring of crushed eggshells or coarse coffee grounds around the base of the plant on top of the soil — it makes crossing uncomfortable for soft-bodied pests. Remove the worst damaged leaves and keep the pot area clean and not overcrowded.
Bok choy is a cool-season leafy crop, so keep it out of strong heat and water the soil in the morning, not the leaves. Damp hiding spots attract slugs, so dry, open conditions help.
Your bok choy seedlings are leggy because they are reaching for light in a spot that is too dim and too warm, but you can usually save them without starting over. This cool-season leafy green prefers at least five hours of direct sun and air temperatures between 5 and 25°C; a heated room and a shaded windowsill push seedlings to stretch. Move the pot to the brightest, coolest place you have — a balcony, an unheated porch, or a clear west- or east-facing window. Thin out the weakest seedlings by snipping them at the base so the rest grow sturdy stems. Water only when the top inch of soil feels dry and give no liquid feed; a sprinkle of finished compost in the potting mix is enough. If the stems are already so thin that they flop and can't recover, do start over — bok choy germinates in about 7 days and is harvestable in 45, so you'll still get a crop. Sow a few extra seeds per pot and put them in that bright, cool spot right from day one.
Pick the caterpillars and eggs off by hand every morning, and cover your bok choy with fine netting or mesh so the butterflies can’t lay more. That instant removal is the most direct natural control.
Those little green caterpillars are the larvae of white butterflies, which lay small yellow eggs on the underside of leaves. In a pot, the colony is small enough to manage by inspection. Look under every leaf, squish any eggs you see, and drop the caterpillars into soapy water. Do this daily for a week, and the population will collapse.
Keep the plant in a bright spot (bok choy wants full sun) and don’t overwater. Healthy plants outgrow nibbling. If the soil has been staying soggy, ease off water until the top feels dry. Because it’s a fast 45-day crop, even a few damaged leaves are fine to eat once washed. For extra insurance, plant marigolds or herbs nearby to confuse the butterflies. No sprays are needed if you’re persistent with handpicking and netting.
Sow bok choy seeds about half a centimeter deep in moist seed-starting mix, and they will germinate in about 7 days. That's the whole trick: seeds need consistent moisture and warmth, but bok choy is a cool-season crop, so don't let the soil get hot or dry out. Keep the tray in a bright spot with around 5 hours of sun, but if it's too warm (above 25°C), move it to a cooler windowsill. Water gently by misting or from the bottom so you don't wash the tiny seeds away. Once the seedlings have their first true leaves, thin them to the strongest one per small pot, or transplant into a container of at least 4 liters. Keep the soil evenly damp, not soggy. Bok choy can handle cool conditions down to about 5°C, so you can harden it off early. Feed lightly with diluted compost tea once the leaves are growing. You'll be cutting your own leaves in about 45 days.
Choose a tray deep enough to hold 4 liters of growing mix per bok choy plant — that gives the roots enough room without wasting space in a greenhouse. Bok choy is a leafy, cool-season crop with a shallow root system, so it doesn’t need extreme depth; what matters more is consistent moisture and good drainage. A tray that holds 4 liters of soil per plant strikes that balance, letting roots spread while avoiding waterlogging.
If you’re sowing several plants, give each one that 4-liter volume and space them so leaves can touch. Fill the tray with a rich, organic compost-based mix, and keep the top inch of soil evenly damp. In greenhouse conditions, bok choy germinates in about 7 days at cool temperatures (between 5°C and 25°C). Give it around 5 hours of direct sun, and it’ll be ready to harvest in roughly 45 days. Don’t use synthetic fertilisers — top-dress with compost or a homemade liquid feed when leaves start yellowing. Also ensure the tray has drainage holes, and lift it off the bench slightly for airflow. For other leafy greens, the same 4-liter depth works well.
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Watch how it's done
If you haven't sown yet, the full container guide covers pot size, light, timing and what it costs versus buying it: how to grow bok choy at home in a pot.