Shirley poppy · Istanbul, Istanbul, Turkey
When to sow shirley poppies in Istanbul
Main outdoor window
23 Jan - 13 Feb
The window this page is built around.
Timed from last spring frost
20 February
In Istanbul, on your chosen risk.
Ready to pick
24 Mar - 13 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 Istanbul
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
23 Jan - 13 Feb
Four weeks before your last frost.
In flower
24 Mar - 13 Apr
Shirley poppies through the year
Against the frost risk in Istanbul
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 Istanbul.
Hardiness is not the obstacle here. Istanbul is zone 9b, 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 303 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 Istanbul
Other flowers to time
Growing shirley poppies in Istanbul
When should I plant shirley poppies in Istanbul?
Aim for 23 Jan - 13 Feb in an average year. If you would rather not gamble on the weather, wait until 18 Feb - 11 Mar - by then frost has finished in nine years out of ten.
When will shirley poppies be ready to harvest in Istanbul?
Expect to start picking around 24 Mar - 13 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.