GardenAnnual Leafy Green · 13 varieties
Bok choy
Brassica rapa (Chinensis group)
Brassicaceae — the same plant family as cabbage, radish, broccoli, cauliflower and 12 more here. Relatives share pests and diseases, which is why rotation plans group by family.
Bok choy (Brassica rapa (Chinensis group)) is an annual leafy green. It wants full sun and pH 6–7.5 soil, with about 1 in of water weekly. It matures in about 60 days from sowing, or 30–45 days from setting out a transplant. Watch for aphids and clubroot. Below: its full sourced profile from 6 extension sources, plus a planting calendar timed to your frost dates.
Typical dates for zone 6b — set your zone or ZIP for yours. This calendar assumes the crop is started indoors. Timing is a guide from the crop's sourced growth stages; confirm with your local frost dates and extension before you sow.
What we will not put a number on
We do not give a feeding rate for this crop, and that is deliberate rather than a gap. The figures published by extension services are pounds of nitrogen per acre for a production field — they do not convert safely to a raised bed or a pot without knowing your soil test and your fertilizer's analysis, and guessing errs toward burning roots. It is also why every chart you find online disagrees with the next one.
We give watering as a depth per week rather than gallons per plant, because that is how it is actually measured and how the published figures are written. A gallons-per-plant number depends on your spacing, your soil and whether the plant is in a pot — so it would look more precise than it is.
Site & soil
- Sun
- Full sun
- Soil pH
- 6–7.5
- Soil texture
- Loam, Clay, Well drained
- Frost tolerance
- Half hardy
- Runs to seed after cold nights below
- 50 °F
No published figure for the temperature frost starts to hurt it, the temperature that would kill it and a heat limit. We looked — where a number is missing here it is missing from the research, not skipped. The crop’s frost and heat tolerance above still applies.
The plant
- Mature height
- 0.5–2 ft
- Mature spread
- 6–18 in
- Growth rate
- Fastest
- Spacing in row
- 12–18 in
- Between rows
- 12–18 in
- Planting depth
- 0.25–0.5 in
- Container size
- 1 galest
- Support
- Self-supportingest
- Grown from
- Direct sow, Transplant
Water & feeding
- Water needs
- Moderate
- Water per week
- 1 in/wk
- Critical water
- Germinationest
- Feeding
- Moderate
Timing & fruiting
- Days to maturity
- 60 days from seed · 30–45 days from transplantest
- Harvest cues
- Rapid leaf growth
Planted again for autumn
- Set plants out by
- late Sep typical · zone 6b
30 days to maturity from setting a plant out — that is what our sources measure for this crop, so this is a date for planting out and not a sowing date, counted back from the first frost above. Not published for anywhere in particular: it is your own frost date and this crop's own figure, which is why it works wherever you are. A days-to-maturity figure is a catalog number for a good season rather than a promise, and a cold month moves it.
Edible parts per source: leaf, stem, flower.
Compiled from the extensions cited below. Which ones actually show up depends on your region — your extension's local list is the last word.
Different parts differ — the edible part is the leaf and stem and flower; the notes below flag other parts or preparations.
Petshorses
Recorded exactly as the source states it — not medical or veterinary advice. If a person or animal may have eaten a toxic part, call Poison Control (1-800-222-1222) or your vet / the ASPCA line (888-426-4435).
| Variety | Type | Habit | Days | Color | What it is known for |
|---|---|---|---|---|---|
| Black Summer F1 | Full Size | 45 | Johnny's Selected Seeds describes this astakes the heat · takes the cold · slow to run to seed in heat | ||
| Canton Heirloom | White-Stem | 50 | True Leaf Market describes this astakes the heat | ||
| Chinese White Cabbage | White-Stem | 30–45 | Plant World Seeds describes this asslow to run to seed in heat | ||
| Ching-Chiang Heirloom | Baby | Dwarf | 40 | Territorial Seed Company describes this astakes the heat · takes the cold | |
| Joi Choi F1 | White-Stem | 50 | Johnny's Selected Seeds describes this astakes the heat · takes the cold | ||
| Mei Qing Choi F1 | Full Size | Vase Shaped | 45 | Johnny's Selected Seeds describes this asslow to run to seed in heat · takes the heat · takes the cold | |
| Prize Choi Heirloom | White-Stem | Upright | 45–50 | Uprising Seeds describes this asslow to run to seed in heat | |
| Purple Lady F1 | Upright | 45 | Purple | ||
| Red Pac Choi F1 | 45 | Purple | |||
| Rosie F1 | Baby | 45 | Purple | Johnny's Selected Seeds describes this astakes the cold | |
| Shanghai Green Heirloom | Shanghai | 45 | True Leaf Market describes this astakes the heat | ||
| Toy Choy F1 | Baby | 30–35 | Botanical Interests describes this astakes the heat | ||
| Win-Win Choi F1 | White-Stem | Vase Shaped | 52 | Johnny's Selected Seeds describes this astakes the cold |
- Clemson Cooperative Extension HGIC
- Johnny's Selected Seeds
- Missouri Botanical Garden
- NC State Extension
- University of Guam Cooperative Extension & Outreach (CNAS)
- University of Minnesota Extension
We compile bare facts from these university-extension and horticultural sources, never copied prose. 15 of the 20 values on this page carry a citation. The rest are marked est; hover one and it says why — either nobody publishes a figure we could point at, or a person set it and attached no source. Figures vary with climate and seed source; confirm with your local extension before you buy.
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