Chives · Qingpu, Shanghai, China
When to plant chives in Qingpu
Main outdoor window
2-23 Feb
The window this page is built around.
Timed from last spring frost
2 March
In Qingpu, on your chosen risk.
Ready to pick
3 Apr - 3 May
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 Qingpu
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.
Start indoors
5-26 Jan
Eight weeks before your last frost, under cover or on a windowsill.
Sow direct
2-23 Feb
Four weeks before your last frost.
Plant
2-23 Feb
Four weeks before your last frost.
Harvest
3 Apr - 3 May
Chives through the year
Against the frost risk in Qingpu
Why these dates
Sow once and divide every third year. First-year plants are thin; the crop is properly established in year two.
Fully dormant-hardy to -25C. Emerges as soon as soil temperature passes about 5C, often weeks before the last frost.
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. Chives are timed from 8 weeks before that frost for an indoor start, with planting out 4 weeks before it, and this page simply resolves those offsets against the frost date computed for Qingpu.
Growing chives in Qingpu
When should I plant chives in Qingpu?
Aim for 2-23 Feb in an average year. If you would rather not gamble on the weather, wait until 14 Feb - 7 Mar - by then frost has finished in nine years out of ten.
When will chives be ready to harvest in Qingpu?
Expect to start picking around 3 Apr - 3 May, based on 60 to 90 days to maturity from the planting date calculated for this location.
How much frost will chives tolerate?
Fully dormant-hardy to -25C. Emerges as soon as soil temperature passes about 5C, often weeks before the last frost.