Yacon · Dengzhou, Henan, China
When to plant yacon in Dengzhou
Main outdoor window
17 Mar - 14 Apr
The window this page is built around.
Timed from last spring frost
10 March
In Dengzhou, on your chosen risk.
Ready to pick
1 Oct - 30 Nov
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 Dengzhou
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 rhizomes
17 Mar - 14 Apr
One week after your last frost.
Harvest
1 Oct - 30 Nov
Yacon through the year
Against the frost risk in Dengzhou
Why these dates
Plant rhizomes after the last frost. Lift when the first frost blackens the tops, and store the crowns frost-free for replanting.
Top growth is killed at 0C. The tubers survive a light frost in the ground but not a freeze, so they are lifted promptly.
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. Yacon are timed with planting out 1 weeks after it, and this page simply resolves those offsets against the frost date computed for Dengzhou.
Hardiness is not the obstacle here. Dengzhou is zone 8b, 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 260 days, against 150 to 210 days to maturity for this crop counted from sowing. That margin is what decides whether a late sowing is worth attempting.
Also in Dengzhou
Other vegetables to time
Growing yacon in Dengzhou
When should I plant yacon in Dengzhou?
Aim for 17 Mar - 14 Apr in an average year. If you would rather not gamble on the weather, wait until 30 Mar - 27 Apr - by then frost has finished in nine years out of ten.
When will yacon be ready to harvest in Dengzhou?
Expect to start picking around 1 Oct - 30 Nov, based on 150 to 210 days to maturity from the planting date calculated for this location.
How much frost will yacon tolerate?
Top growth is killed at 0C. The tubers survive a light frost in the ground but not a freeze, so they are lifted promptly.