Vietnamese coriander · Yaroslavl, Yaroslavl Oblast, Russia
When to plant vietnamese coriander in Yaroslavl
Main outdoor window
1-22 Jul
The window this page is built around.
Timed from last spring frost
8 May
In Yaroslavl, on your chosen risk.
Ready to pick
1 Jun - 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 Yaroslavl
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 out
1-22 Jul
Held back until the soil is warm enough for this crop. The frost date on its own would say 22 May, which is too cold for it to start.
Harvest
1 Jun - 31 Oct
Vietnamese coriander through the year
Against the frost risk in Yaroslavl
Why these dates
Plant out after the last frost. Grows from cuttings in water within days; seed is rarely available and rarely needed.
No frost tolerance at all. Overwinter a cutting indoors rather than trying to protect the plant.
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. Vietnamese coriander are timed with planting out 2 weeks after it, and this page simply resolves those offsets against the frost date computed for Yaroslavl.
With one correction, which is the note at the top of the page: the offset alone would put this crop in soil that is still too cold for it. Where the frost date and the soil temperature disagree, the dates here follow the soil, because a seed in cold ground either rots or waits, and a sowing made a fortnight later usually overtakes it.
Yaroslavl sits in zone 4a, which is colder than this crop is rated for, so it will need winter protection or a container that can be moved under cover. The dates below still describe the right time of year; the open question is survival rather than timing.
Do not expect a crop in the first year. A plant set out now should give its first worthwhile pick around year 1, and will then produce every year after that, which is what makes the planting decision worth getting right the first time.
Growing vietnamese coriander in Yaroslavl
When should I plant vietnamese coriander in Yaroslavl?
Aim for 1-22 Jul in an average year. If you would rather not gamble on the weather, wait until 1-22 Jul - by then frost has finished in nine years out of ten.
Can I plant vietnamese coriander earlier in Yaroslavl?
Frost is finished by about 22 May, but the soil is still too cold. Vietnamese coriander will not start until it reaches 18°C (64.4°F), and here that is around 1 Jul. Going in earlier usually means seed that rots or transplants that sit and sulk, and a later sowing catches them up.
When will vietnamese coriander be ready to harvest in Yaroslavl?
Expect to start picking around 1 Jun - 31 Oct, based on 60 to 80 days to maturity from the planting date calculated for this location.
How much frost will vietnamese coriander tolerate?
No frost tolerance at all. Overwinter a cutting indoors rather than trying to protect the plant.