When to sow sunflowers in Kazan

Why these dates

Sow a short row every two weeks until ten weeks before first frost for continuous cut flowers rather than one brief spectacle.

Seedlings are killed by frost. Once flowering, stems tolerate a light autumn frost without damage.

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. Sunflowers are timed for direct sowing 1 weeks after it, and this page simply resolves those offsets against the frost date computed for Kazan.

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.

The median frost-free season here is 149 days, against 70 to 100 days to first flower for this crop counted from sowing. That margin is what decides whether a late sowing is worth attempting.

See every crop timed for Kazan →