One Kilo Slow Bolt Napa Cabbage is a cool-season brassica bred specifically to resist the premature flowering that plagues traditional napa varieties in unpredictable spring weather. With a 50 to 55 day harvest window, it delivers crisp, tender heads across hardiness zones 3 through 11, thriving in full sun to partial shade with moderate water and well-balanced soil. The variety's cold tolerance and bolting resistance make it a reliable choice for both spring and fall crops, particularly valuable for gardeners working with marginal frost dates or variable temperatures.
Partial Sun
Moderate
3-11
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Moderate
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The name says it all: this napa cabbage was engineered to stay in the vegetative stage even when temperatures dip unexpectedly. Rather than sending up a flower stalk at the first cold snap, One Kilo Slow Bolt holds its heading stage, giving you a genuine harvest window instead of a race against Mother Nature. For gardeners in zones with unpredictable springs or short growing seasons, this becomes the difference between a full head of cabbage and a bolt-ruined crop.
Napa cabbage is fundamental to Asian cuisines, most notably as the base for kimchi, sauerkraut, and fresh salads. The tender, crinkled leaves are equally at home in stir-fries, braised dishes, and quick pickles. Its mild flavor and crisp texture make it more delicate than storage cabbages, so it's typically eaten fresh or lightly fermented rather than long-cooked.
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Start seeds 4 to 6 weeks before your average last frost date in biodegradable pots to minimize root disturbance at transplanting. Maintain soil temperature at 75 to 85 degrees Fahrenheit for germination. Transplant seedlings outdoors after your average last frost date, or for a fall crop, start seeds 4 to 6 weeks before your intended transplanting date.
Harden off seedlings gradually before moving them into the garden. Transplant after your average last frost date for a summer crop, spacing plants 24 inches apart in rows 24 inches apart. For a fall crop in mild climates, sow in fall for a cool-season harvest.
Direct sow outside 2 to 4 weeks before your average last frost date for a summer crop or 8 to 10 weeks before your average first fall frost date for a fall crop. Maintain soil temperature at 75 to 85 degrees Fahrenheit for reliable germination.
Harvest heads 50 to 55 days after sowing or transplanting when they feel firm to the touch and have reached full size. Cut the entire head at the base with a sharp knife just above the soil line. The variety's slow-bolting character means you have a genuine window to wait for optimal head development without racing against flowering.
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