When should I plant Choy Sum?

Sow seed indoors 6–4 weeks before your last spring frost. Move seedlings into the garden from 2 weeks before to 1 weeks after your last spring frost. Sow seed straight into the ground from 3 weeks before to 2 weeks after your last spring frost. For a fall crop, sow 9–6 weeks before your first fall frost.

How far apart do I plant Choy Sum?

Space Choy Sum about 6″ apart. It grows best in part sun.

What grows well with Choy Sum?

Good companions for Choy Sum include Beet, Onion, Carrot, Dill, Gai Lan. Keep it away from Strawberry.

What zones does Choy Sum grow in?

Choy Sum is suited to USDA zones 4–10 and takes ~45 days to harvest.

How to grow Choy Sum (Brassica rapa var. parachinensis)

The sweet, quick flowering-stem brassica of Cantonese kitchens; mild, juicy, and fast from seed to wok.

Quick tip

Grown for its slender flowering stems - snap them off with the yellow buds just opening, and more will follow.

⛅ Part sun↔ 6″ apartZones 4–10⏳ ~45d

When to plant Choy Sum

Start indoorsSow seed indoors 6–4 weeks before your last spring frost.
Transplant outMove seedlings into the garden from 2 weeks before to 1 weeks after your last spring frost.
Direct sowSow seed straight into the ground from 3 weeks before to 2 weeks after your last spring frost.
Fall sowingFor a fall crop, sow 9–6 weeks before your first fall frost.

At a glance

Botanical name

Brassica rapa var. parachinensis

Companion planting

Plant near

Keep apart from

Strawberry

🌱 A fast flowering brassica; alliums and dill help keep aphids and flea beetles off.

Plan Choy Sum for your zone →