The Garden Line · heirloom · open-pollinated · untreated
Red Russian Kale
Siberian heirloom with flat, oak-leaf foliage and purple stems. Tender enough for salads, hardy enough to overwinter — the hardiest kale we grow.
Days to maturity
50
Spacing
12–18 in
Sowing window
Mar–Aug
Tested by the seedsman
- Germination
- 96% · tested Jun 2026
- Lot
- KL-2605-A
- Treatment
- None — untreated
- Origin
- USA · open-pollinated heirloom
Signed off by Jon Emery, RN, trained in the Soil Food Web method. How we test →
How to grow
Sow early, sow late.
Direct-sow spring or late summer; it overwinters in most zones and is sweetest after frost.
Growing notesNutrition
Dense, and documented.
Kale ranks among the most nutrient-dense greens in USDA FoodData Central (FDC #168421).
We cite sources, not claims.
The variety
Out of Siberia.
Brought to North America by Russian traders in the 1800s; the tenderest of the hardy kales.
Variety pagesMore from the Garden Line
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The Garden Line Collection
every lot tested · Jul 2026
$19.00
Written by Jon Emery, RN · trained in the Soil Food Web method · Lot data updated Jul 2026