Honeywort · Hyesan, Yanggang-do, North Korea
When to sow honeyworts in Hyesan
Main outdoor window
1-22 May
The window this page is built around.
Timed from last spring frost
15 May
In Hyesan, on your chosen risk.
Ready to pick
20 Jul - 9 Aug
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 Hyesan
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
20 Mar - 10 Apr
Eight weeks before your last frost, under cover or on a windowsill.
Sow direct
1-22 May
Two weeks before your last frost.
Plant out
1-22 May
Two weeks before your last frost.
In flower
20 Jul - 9 Aug
Honeyworts through the year
Against the frost risk in Hyesan
Why these dates
Sow indoors eight weeks before the last frost and plant out two weeks before, or sow direct two weeks before it. The seed is large and germinates best in the dark, so cover it properly. Self-seeds readily on light soil and comes true.
Hardy to about -8C, so autumn sowing works in zone 8 and milder. Needs sharp drainage above all: it rots in a wet winter long before the cold reaches it.
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. Honeyworts are timed from 8 weeks before that frost for an indoor start, with planting out 2 weeks before it, and this page simply resolves those offsets against the frost date computed for Hyesan.
Hardiness is not the obstacle here. Hyesan is zone 4b, 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 137 days, against 80 to 100 days to first flower for this crop counted from sowing. That margin is what decides whether a late sowing is worth attempting.
Also in Hyesan
Other flowers to time
Growing honeyworts in Hyesan
When should I plant honeyworts in Hyesan?
Aim for 1-22 May in an average year. If you would rather not gamble on the weather, wait until 13 May - 3 Jun - by then frost has finished in nine years out of ten.
When will honeyworts be ready to harvest in Hyesan?
Expect to start picking around 20 Jul - 9 Aug, based on 80 to 100 days to maturity from the planting date calculated for this location.
How much frost will honeyworts tolerate?
Hardy to about -8C, so autumn sowing works in zone 8 and milder. Needs sharp drainage above all: it rots in a wet winter long before the cold reaches it.