Brassica rapa (Chinensis Group) 'Red Choi'

RHS Plant Profile
pak choi 'Red Choi'

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pak choi 'Red Choi' RHS
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An annual brassica grown for it edible fleshy, green stems and paddle-shaped leaves with dark red to purple upper surfaces and green undersides

Position

Full sun

Soil Types

Loam

Max Height

0.1-0.5 metres

Max Spread

0.1-0.5 metres

Size

Time to Maturity
1–2 years
Max Spread
0.1-0.5 metres
Max Height
0.1-0.5 metres

Growing Conditions

Loam
Moisture
Moist but well–drained
pH
Alkaline or Neutral

Position

Full sun
Aspect
South–facing or West–facing
Exposure
Sheltered
Hardiness

Hardiness Ratings

All ratings refer to the UK growing conditions unless otherwise stated. Minimum temperature ranges (in degrees C) are shown in brackets

  • H1A: under glass all year (>15C)
  • H1B: can be grown outside in the summer (10 - 15)
  • H1C: can be grown outside in the summer (5 - 10)
  • H2: tolerant of low temperatures, but not surviving being frozen (1 to 5)
  • H3: hardy in coastal and relatively mild parts of the UK (-5 to 1)
  • H4: hardy through most of the UK (-10 to -5)
  • H5: hardy in most places throughout the UK even in severe winters (-15 to -10)
  • H6: hardy in all of UK and northern Europe (-20 to -15)
  • H7: hardy in the severest European continental climates (< -20)
H3

Colour & Scent

Season Stem Flower Foliage Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family
Brassicaceae
Native to GB/Ireland
No
Foliage
Deciduous
Habit
Columnar upright
Genus
Brassicas can be annual, biennial or perennial plants, most are upright with alternate, often glaucous leaves, long taproots and clusters of cross-shaped, yellow or white flowers. The genus includes a number of species bred to produce food crops, such as cabbages, turnips, mustards and oilseed rape, as well as others grown for their ornamental value
Name Status
Unresolved

How to Grow

Cultivation

Sow seeds thinly from late spring to summer in a deep,fertile, moist but well-drained soil in a sunny position and keep well-watered to avoid bolting. See Pak choi section in Vegetable cultivation for further information

Propagation

Propagate by seed. See sowing vegetable seeds

Pruning

No pruning required

Pests

Susceptible to flea beetle, aphids, cabbage caterpillars, cabbage whitefly and cabbage root fly

Diseases

Susceptible to club root, powdery mildew and downy mildew