Tomatillo · Shanghai, Shanghai, China
When to plant tomatillos in Shanghai
Main outdoor window
16 Mar - 6 Apr
The window this page is built around.
Timed from last spring frost
2 March
In Shanghai, on your chosen risk.
Ready to pick
1 Aug - 31 Oct
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 Shanghai
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
19 Jan - 9 Feb
Six weeks before your last frost, under cover or on a windowsill.
Plant out
16 Mar - 6 Apr
Two weeks after your last frost.
Harvest
1 Aug - 31 Oct
Tomatillos through the year
Against the frost risk in Shanghai
Why these dates
Start indoors six weeks before the last frost and plant out two weeks after it. Fruit is ready when it fills and then splits the papery husk.
Killed at 0C. It sets fruit in heat that makes tomatoes drop their flowers, which is the main reason to grow it in a hot climate.
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. Tomatillos are timed from 6 weeks before that frost for an indoor start, with planting out 2 weeks after it, and this page simply resolves those offsets against the frost date computed for Shanghai.
The median frost-free season here is 287 days, against 75 to 100 days to maturity for this crop counted from planting out. That margin is what decides whether a late sowing is worth attempting.
Also in Shanghai
Other vegetables to time
Growing tomatillos in Shanghai
When should I plant tomatillos in Shanghai?
Aim for 16 Mar - 6 Apr in an average year. If you would rather not gamble on the weather, wait until 28 Mar - 18 Apr - by then frost has finished in nine years out of ten.
When will tomatillos be ready to harvest in Shanghai?
Expect to start picking around 1 Aug - 31 Oct, based on 75 to 100 days to maturity from the planting date calculated for this location.
How much frost will tomatillos tolerate?
Killed at 0C. It sets fruit in heat that makes tomatoes drop their flowers, which is the main reason to grow it in a hot climate.