Shiso · Angarsk, Irkutsk Oblast, Russia
When to plant shiso in Angarsk
Main outdoor window
27 May - 17 Jun
The window this page is built around.
Timed from last spring frost
20 May
In Angarsk, on your chosen risk.
Ready to pick
12 Aug - 1 Sep
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 Angarsk
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
8-29 Apr
Six weeks before your last frost, under cover or on a windowsill.
Sow direct
27 May - 17 Jun
One week after your last frost.
Plant out
3-24 Jun
Two weeks after your last frost.
Harvest
12 Aug - 1 Sep
Shiso through the year
Against the frost risk in Angarsk
Why these dates
Killed by the first frost, like basil.
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. Shiso 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 Angarsk.
The median frost-free season here is 123 days, against 70 to 90 days to maturity for this crop counted from planting out. That margin is what decides whether a late sowing is worth attempting.
Growing shiso in Angarsk
When should I plant shiso in Angarsk?
Aim for 27 May - 17 Jun in an average year. If you would rather not gamble on the weather, wait until 3-24 Jun - by then frost has finished in nine years out of ten.
When will shiso be ready to harvest in Angarsk?
Expect to start picking around 12 Aug - 1 Sep, based on 70 to 90 days to maturity from the planting date calculated for this location.
How much frost will shiso tolerate?
Killed by the first frost, like basil.