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Repotting guide

When & how to repot Pak Choi (Brassica rapa subsp. chinensis)

Also called Bok choy, Chinese cabbage, Pak choy.

More about pak choi

About Pak Choi

Brassica rapa subsp. chinensis · also called Bok choy, Chinese cabbage · edible

Pak choi is a fast, succulent Asian brassica grown for its crisp white or green leaf stalks and tender dark leaves in a loose, non-heading rosette. It crops in as little as 4-8 weeks and is ideal for stir-fries. Quick and easy, it suits spring and late-summer sowings; hot, dry conditions and long days readily trigger bolting, so cool, moist growing is key.

Mature size: 20-30 cm tall and 15-25 cm wide (baby types smaller)

How to tell pak choi needs repotting

Repotting on a calendar is less reliable than reading the plant. For pak choi, watch for these signs:

For the underlying biology of a pot-bound root system and why it stalls a plant, see our guide to spotting and fixing a root-bound plant.

How often to repot pak choi

Every 2–3 years, into bone-dry mix. Pak Choi's growth habit — compact, non-heading rosette of upright, spoon-shaped leaves on thick, fleshy, overlapping leaf stalks that flare from a short central base. — sets the pace. Pak choi is a fast, succulent Asian brassica grown for its crisp white or green leaf stalks and tender dark leaves in a loose, non-heading rosette. It crops in as little as 4-8 weeks and is ideal for stir-fries. Quick and easy, it suits spring and late-summer sowings; hot, dry conditions and long days readily trigger bolting, so cool, moist growing is key.

What size pot to step pak choi up to

Use a pot only one size up — or even the same pot with fresh gritty mix if the roots have room. Pak Choi stores water and rots in a large pot of slow-drying soil. A tight terracotta pot that dries fast is far safer than a generous plastic one. Never up-pot a succulent by several sizes.

Not sure of the exact diameter? Our pot size calculator takes the current pot and root spread and tells you the right next size — it deliberately recommends a single step up, never a big jump.

The best time of year to repot pak choi

Spring or summer, while pak choi is in active growth and warm, is best — roots recover fastest then, and the plant is not sitting in cool damp soil. Avoid repotting a succulent in winter dormancy.

Step-by-step: repotting pak choi

  1. Repot dry. Do not water pak choi for several days first. Working with dry roots and dry mix dramatically lowers the rot risk for a succulent.
  2. Pick a snug, fast-draining pot. Choose terracotta one size up at most, with a drainage hole. Have gritty fertile, moisture-retentive loam, ph 6.0-7.5 ready.
  3. Tip it out and clean the roots. Slide the plant out, crumble off the old soil, and trim any black, mushy or dead roots with clean snips.
  4. Pot into dry mix. Set pak choi at its original depth in dry gritty mix, firming gently. Do not bury the stem deeper than it was.
  5. Wait a week before watering. Leave it completely dry and out of harsh sun for about 7 days so any damaged roots callus. Only then water lightly.

Aftercare

Keep pak choi completely dry and out of fierce sun for about a week so any nicked roots callus before they meet moisture; watering a freshly repotted succulent is the classic way to rot it. Then resume the normal lean, dry rhythm. Do not fertilise for about 3 weeks — fresh mix already carries nutrients and feeding freshly disturbed roots scorches them.

The right soil mix for pak choi

Pak Choi wants fertile, moisture-retentive loam, ph 6.0-7.5. Wants rich, free-draining but water-holding ground with plenty of compost. Steady fertility and moisture drive the fast growth that keeps stalks crisp and sweet; thin quickly to prevent crowding. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting pak choi — frequently asked questions

How often should you repot pak choi?

Every 2–3 years, into bone-dry mix for pak choi. Repot pak choi every 2–3 years into a snug pot of fertile, moisture-retentive loam, ph 6.0-7.5, ideally in spring or summer. Let it sit in dry soil and do not water for about a week afterwards so any nicked roots can callus. Over-potting and watering straight away is what rots succulents.

What size pot does pak choi need?

Use a pot only one size up — or even the same pot with fresh gritty mix if the roots have room. Pak Choi stores water and rots in a large pot of slow-drying soil. A tight terracotta pot that dries fast is far safer than a generous plastic one. Never up-pot a succulent by several sizes. Use our pot size calculator to size it from the plant's current pot and root spread.

When is the best time of year to repot pak choi?

Spring or summer, while pak choi is in active growth and warm, is best — roots recover fastest then, and the plant is not sitting in cool damp soil. Avoid repotting a succulent in winter dormancy.

Should you water pak choi after repotting?

No — not straight away. Repot pak choi into dry mix and wait about a week before the first watering so any damaged roots callus over. Watering a freshly repotted succulent is the single most common way to rot one.

Should you fertilise pak choi after repotting?

Not immediately. Wait about 3 weeks after repotting pak choi. Fresh mix already contains nutrients, and feeding freshly cut or disturbed roots burns them. Resume your normal feeding routine once you see new growth.

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