Grecian windflower · Hanam, Gyeonggi-do, South Korea
When to sow grecian windflowers in Hanam
Main outdoor window
16-30 Sep
The window this page is built around.
Timed from last spring frost
12 April
In Hanam, on your chosen risk.
Ready to pick
1 Mar - 30 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 Hanam
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.
Plant the tubers
16-30 Sep
Four to six weeks before your first frost, so roots form before the ground cools.
In flower
1 Mar - 30 Apr
Grecian windflowers through the year
Against the frost risk in Hanam
Why these dates
Soak the tubers overnight before planting - they arrive bone dry and dehydrated tubers frequently fail. Plant 5cm deep in early autumn, any way up; the growing point is impossible to identify and the tuber sorts itself out.
Hardy to about -20C. Flowers early enough that a hard frost sometimes catches open blooms, which recover. Goes fully dormant by midsummer and tolerates dry summer shade better than most spring bulbs.
Grecian windflowers are anchored to the first autumn frost rather than the last spring one, so the planting window on this page counts backwards from the end of the season in Hanam instead of forwards from its start.
Hardiness is not the obstacle here. Hanam is zone 6b, 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 199 days, against 140 to 180 days to first flower for this crop counted from sowing. That margin is what decides whether a late sowing is worth attempting.
Nearby
Grecian windflowers in places close by
Also in Hanam
Other flowers to time
Growing grecian windflowers in Hanam
When should I plant grecian windflowers in Hanam?
Aim for 16-30 Sep in an average year. If you would rather not gamble on the weather, wait until 5-19 Sep - by then frost has finished in nine years out of ten.
When will grecian windflowers be ready to harvest in Hanam?
Expect to start picking around 1 Mar - 30 Apr, based on 140 to 180 days to maturity from the planting date calculated for this location.
How much frost will grecian windflowers tolerate?
Hardy to about -20C. Flowers early enough that a hard frost sometimes catches open blooms, which recover. Goes fully dormant by midsummer and tolerates dry summer shade better than most spring bulbs.