Komatsuna · Shangzhi, Heilongjiang, China
When to plant komatsuna in Shangzhi
Main outdoor window
15 Apr - 13 May
The window this page is built around.
Timed from last spring frost
6 May
In Shangzhi, on your chosen risk.
Ready to pick
1 May - 30 Nov
If you plant at the start of the window.
The average last frost. Half of all years are later than this.
Step by step in Shangzhi
Each window is a range, not a single day. Earlier in the range buys you a longer season; later in it buys you a safer one.
Sow for overwintering
10-31 Jul
Counting back 64 days from your first frost so the crop matures in time.
Sow direct
15 Apr - 13 May
Three weeks before your last frost.
Harvest
1 May - 30 Nov
Komatsuna through the year
Against the frost risk in Shangzhi
Why these dates
Sow from three weeks before the last frost and every two to three weeks thereafter. It tolerates summer sowings better than most of its relatives.
Hardy to around -8C. Unprotected plants keep growing slowly through mild winters rather than merely surviving them.
Seed packets and extension guides express timing as weeks either side of the last spring frost, because that is the only reference point that travels. Komatsuna are timed for direct sowing 3 weeks before it, and this page simply resolves those offsets against the frost date computed for Shangzhi.
The median frost-free season here is 151 days, against 35 to 50 days to maturity for this crop counted from sowing. That margin is what decides whether a late sowing is worth attempting.
Also in Shangzhi
Other vegetables to time
Growing komatsuna in Shangzhi
When should I plant komatsuna in Shangzhi?
Aim for 15 Apr - 13 May in an average year. If you would rather not gamble on the weather, wait until 19 Apr - 17 May - by then frost has finished in nine years out of ten.
When will komatsuna be ready to harvest in Shangzhi?
Expect to start picking around 1 May - 30 Nov, based on 35 to 50 days to maturity from the planting date calculated for this location.
How much frost will komatsuna tolerate?
Hardy to around -8C. Unprotected plants keep growing slowly through mild winters rather than merely surviving them.