Shirley poppy · Yanghang, Shanghai, China
When to sow shirley poppies in Yanghang
Main outdoor window
3-24 Feb
The window this page is built around.
Timed from last spring frost
3 March
In Yanghang, on your chosen risk.
Ready to pick
4-24 Apr
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 Yanghang
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 direct
3-24 Feb
Four weeks before your last frost.
In flower
4-24 Apr
Shirley poppies through the year
Against the frost risk in Yanghang
Why these dates
Sow direct four weeks before the last frost, on the surface with no covering - the seed needs light to germinate and disappears if raked in. Sowing onto snow or frosted ground works well and spaces the seed for you. It cannot be transplanted at any size, so sow where it is to flower.
Hardy to about -12C and germinates in cold soil, so it is a natural for autumn or late-winter sowing. Ends abruptly in the first real heat of summer.
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. Shirley poppies are timed for direct sowing 4 weeks before it, and this page simply resolves those offsets against the frost date computed for Yanghang.
Hardiness is not the obstacle here. Yanghang is zone 9a, comfortably inside the range this crop is rated for, so an established plant should come through an average winter without protection.
The median frost-free season here is 286 days, against 60 to 80 days to first flower for this crop counted from sowing. That margin is what decides whether a late sowing is worth attempting.
Also in Yanghang
Other flowers to time
Growing shirley poppies in Yanghang
When should I plant shirley poppies in Yanghang?
Aim for 3-24 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 shirley poppies be ready to harvest in Yanghang?
Expect to start picking around 4-24 Apr, based on 60 to 80 days to maturity from the planting date calculated for this location.
How much frost will shirley poppies tolerate?
Hardy to about -12C and germinates in cold soil, so it is a natural for autumn or late-winter sowing. Ends abruptly in the first real heat of summer.