When to Plant Choy Sum in Zone 5
In USDA zone 5a, plant outdoors April 21 to June 5, and expect your first harvest around June 5. Zone 5 also has a fall planting window opening around August 6. (5a shown here — see 5a and 5b dates separately below.)
Choy Sum planting calendar for USDA Zone 5a
Average last spring frost
May 5
Average first fall frost
October 1
spring planting
Direct sow
Apr 21
Projected first harvest
Jun 5
fall planting
Direct sow
Aug 6
Projected first harvest
Sep 20
spring planting
fall planting
Choy Sum is ready to harvest in about 45 days, needing roughly 149 frost-free days in zone 5a.
Choy Sum planting calendar for USDA Zone 5b
Average last spring frost
April 30
Average first fall frost
October 5
spring planting
Direct sow
Apr 16
Projected first harvest
May 31
fall planting
Direct sow
Aug 10
Projected first harvest
Sep 24
spring planting
fall planting
Choy Sum is ready to harvest in about 45 days, needing roughly 158 frost-free days in zone 5b.
Not sure whether you're in 5a or 5b? Set your ZIP in HomeSown for dates tuned to your exact location.
Varieties to grow
1 variety of choy sum in the HomeSown library. Tap any for its full grow guide.
Common problems with choy sum
What to watch for, with identification and treatment for each
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