Soil & potting mix
Best soil for Purple Choy Sum (Brassica rapa var. parachinensis 'Purple')
Also called purple choy sum, purple Chinese flowering cabbage.
More about purple choy sum
About Purple Choy Sum
Brassica rapa var. parachinensis 'Purple' · also called purple choy sum, purple Chinese flowering cabbage · edible
Purple Choy Sum is an ornamental-yet-edible flowering cabbage with striking purple stems and leaf veins, topped by yellow buds. Grown for sweet, tender stems and shoots, it matures in about 40-55 days, holds colour best in cool weather, and crops cut-and-come-again, adding vivid colour to beds and stir-fries alike.
Preferred mix: Fertile, free-draining loam
Why purple choy sum needs this mix
Purple Choy Sum is a hungry, thirsty crop — it wants a rich, moisture-retentive but free-draining loam, well fed and never baked dry.
- Purple Choy Sum grows fast and has a big crop to fill, so it draws heavily on both nutrients and water — a lean mix simply cannot keep up.
- Plenty of organic matter holds moisture evenly, which prevents the stress problems (bolting, bitterness, blossom-end rot) that come from a drying-then-flooding cycle.
- It still needs structure: rich does not mean airless, so grit, perlite or leaf mould keeps roots oxygenated.
For the full picture on what makes up a good mix, see our guide to the main types of soil and potting media — it explains why each ingredient above behaves the way it does.
What goes wrong with the wrong mix
The wrong soil is one of the most common reasons purple choy sum struggles, and the damage often shows up weeks later as a watering problem. For this species specifically:
- A poor, thin or sandy mix starves purple choy sum — growth stalls, leaves pale, and yields collapse.
- A heavy, compacted, badly drained soil rots the roots and brings fungal problems despite all the feeding.
- Letting a rich mix dry to dust then drowning it causes the classic moisture-stress disorders this crop is prone to.
Under-feeding and inconsistent moisture. Purple Choy Sum needs genuinely rich soil plus steady watering — most disappointing crops come down to one or both being short.
pH — does it matter for purple choy sum?
Purple Choy Sum does best around pH 6.0-7.0 (slightly acidic to neutral). It is worth a cheap soil test for an outdoor bed; very acidic soil benefits from a little lime well before planting.
If you want to check or adjust it, the soil pH guide walks through testing and the safe ways to nudge a mix more acidic or more alkaline.
DIY mix vs a bagged one
For containers a good multipurpose or vegetable compost works for purple choy sum with extra feed through the season. For beds, the real win is digging in plenty of well-rotted compost or manure — that beats any bag.
Drainage and the pot
Rich but free-draining is the target: raised beds and large containers both deliver it. Mulch heavily to even out moisture and roughly halve how often you water.
Purple Choy Sum is usually grown for a single season, so "repotting" means starting fresh each year — never reuse exhausted, disease-prone compost for the same crop family. When the time comes, our repotting guide for purple choy sum covers the timing and technique step by step.
Purple Choy Sum soil — frequently asked questions
What is the best soil mix for purple choy sum?
3 parts compost-amended loam or quality multipurpose compost : 1 part well-rotted garden compost or manure : 1 part perlite or grit (containers) / leaf mould (beds). Purple Choy Sum grows fast and has a big crop to fill, so it draws heavily on both nutrients and water — a lean mix simply cannot keep up.
Can I use normal potting soil for purple choy sum?
A poor, thin or sandy mix starves purple choy sum — growth stalls, leaves pale, and yields collapse. For containers a good multipurpose or vegetable compost works for purple choy sum with extra feed through the season. For beds, the real win is digging in plenty of well-rotted compost or manure — that beats any bag.
Does purple choy sum need a special pH?
Purple Choy Sum does best around pH 6.0-7.0 (slightly acidic to neutral). It is worth a cheap soil test for an outdoor bed; very acidic soil benefits from a little lime well before planting.
Should I buy a bagged mix or make my own for purple choy sum?
For containers a good multipurpose or vegetable compost works for purple choy sum with extra feed through the season. For beds, the real win is digging in plenty of well-rotted compost or manure — that beats any bag.
How often should I refresh the soil for purple choy sum?
Purple Choy Sum is usually grown for a single season, so "repotting" means starting fresh each year — never reuse exhausted, disease-prone compost for the same crop family. Rich but free-draining is the target: raised beds and large containers both deliver it. Mulch heavily to even out moisture and roughly halve how often you water.
Keep reading
- Purple Choy Sum care — the full brief (light, water, humidity, problems, pet safety)
- How often to water purple choy sum — the schedule the mix feeds into
- Repotting purple choy sum — when and how to refresh the mix
- Soil pH guide — test it and adjust it safely
- Should I water my plant? The simple check first
- Why is my plant wilting? Wet vs dry diagnosis
- Underwatered plant — signs and how to rehydrate it
- Best soil for tomato
- Best soil for pepper
- Best soil for cucumber
- All 5561 soil and potting-mix guides in the Growli library