- Variety Info
- Sowing Info
- Growing Info
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Variety Info
Days to Maturity: 50–55 days
Family: Brassicaceae
Native: Unknown
Hardiness: Frost-tolerant biennial, grown as an annual
Exposure: Full sun to part shade
Plant Dimensions: About 9" tall, 20" wide including lateral leaves; the head is about 11" tall and 7" wide
Variety Info: Outer leaves are green and white with a yellowish-green interior. Leaves have a lightly crinkled texture at maturity and have a sweet flavor. Mature, trimmed heads weigh 2–2 ½ pounds. 'One Kilo Slow Bolt' is a wong bok/napa type cabbage.
Attributes: Good for Containers
Sowing Info
When to Sow Outside: RECOMMENDED. 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. Ideal soil temperature for germination is 75°-85°F. Persistent temperatures of 50°F or below while plants are young can cause bolting (premature flowering), cover as necessary.
When to Start Inside: 4 to 6 weeks before your average last frost date transplanting after your average last frost date, and 4 to 6 weeks before transplanting outdoors in summer for a fall crop. Sow in biodegradable pots to avoid root disturbance. Mild Climates: Sow in fall for a cool-season harvest.
Days to Emerge: 7–12 days
Seed Depth: ¼"
Seed Spacing: A group of 3 seeds every 12"–18"
Row Spacing: 24"–30"
Thinning: When 3" tall, thin (and eat!) to 1 every 12"–18"
Your hardiness zone is
Growing Info
Harvesting: Harvest heads when they are well developed, firm, and solid when squeezed. Cut off heads at base with a sharp knife. Cabbages left in the ground beyond maturity are more subject to disease and splitting. Harvest in the morning if possible. If harvested in the heat, dunk in ice water to reduce "field heat" and increase storage time. Allow to drain before storing.
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Cabbage: Sow and Grow Guide- DanielVerified ReviewerRated 5 out of 5 stars9/25/25Crisp, Vigorous, and Perfect for Kimchi!
I grew One Kilo Slow Bolt Chinese Cabbage this season, and the results were outstanding. The heads formed beautifully—large, firm, and full of vibrant, crinkled leaves. The slow-bolt trait really helped in my warm coastal climate, giving me plenty of time to harvest without worrying about early flowering.
The flavor is mild and sweet, and the crunch is exactly what you want for making traditional kimchi. I used my entire harvest for a big kimchi batch, and the leaves salted down perfectly while still holding their texture.
Highly recommend this variety for anyone looking to grow Napa cabbage at home—it’s rewarding, resilient, and absolutely delicious!
Which best describes you as a gardener? IntermediateBIBotanical Interests9/25/25Hey Daniel,
What a fantastic review! We're absolutely thrilled to hear that your One Kilo Slow Bolt Napa Cabbage delivered such outstanding results - those large, firm heads with vibrant, crinkled leaves sound absolutely perfect!
Your experience in a warm coastal climate really highlights what makes the slow-bolt trait so special! There's nothing more frustrating than watching your cabbage go to seed just when the heads are starting to form nicely. The fact that you had plenty of time to harvest without worrying about early flowering shows this variety is doing exactly what it's bred to do - giving you that extended growing window even when temperatures start climbing.
We love that you called out the mild, sweet flavor and perfect crunch! One Kilo Slow Bolt is such a fantastic choice for kimchi-making because it gives you exactly those qualities - that crisp texture that holds up beautifully through the salting process while still maintaining that perfect bite. There's something so satisfying about growing your own Napa cabbage specifically for traditional fermentation projects!
Your comment about the leaves salting down perfectly while holding their texture is music to our ears! That's exactly what you want in a kimchi cabbage - something that transforms beautifully during fermentation but doesn't turn to mush. The fact that you used your entire harvest for one big kimchi batch shows just how productive and rewarding this variety can be.
Your experience will be so encouraging for other home growers who want to try their hand at growing their own kimchi cabbage! One Kilo Slow Bolt really delivers on all fronts - resilience, flavor, and that perfect texture that makes homemade fermented foods so worthwhile.
Keep on growing 🌻️
- Jill S.Verified BuyerRated 5 out of 5 stars9/11/25Sweet giants
These are the only Napa cabbage I grow. They are slow to bolt, and they get huge. When all the other Napa that I’ve tried have bolted or made small, loose heads, this one has consistently made tight, huge, sweet heads. Great for making kimchi or in stir fry’s, or just in a salad.
Which best describes you as a gardener? IntermediateBIBotanical Interests9/16/25Hey Jill,
What an absolutely fantastic review! "Sweet giants" is such a perfect way to describe these One Kilo Slow Bolt Napa Cabbages!
We're so thrilled to hear that you've found your go-to variety! It's amazing that you've gotten such consistently reliable performance from these plants - those tight, huge, sweet heads you're describing are exactly what makes this variety so special. And the fact that they're still producing those beautiful heads when other varieties have already bolted or made loose heads really shows what a winner you've got here!
We love all the ways you're enjoying your harvest too - from kimchi to stir fry to fresh salads, you're really making the most of those sweet, crisp leaves! There's nothing better than a versatile cabbage that performs so reliably season after season.
Thank you so much for sharing such a detailed and helpful review. Your experience with the consistent performance and incredible size of these cabbages will be invaluable for fellow gardeners looking for a dependable Napa variety they can count on!
Keep on growing 🌻️
- Elizabeth O.Rated 5 out of 5 stars4/26/255 Stars
On the recommendation of a local friend (SE TX, Zone 9) I bought these from a local nursery. They germinated quickly & grew well. My only problem was I started them about 6 weeks late. But they grew into massive plants & I had to harvest due to early hot weather. So the heading process didn't really happen. Last year (2024) they did make a head but the snails & loopers got them. Still. We made some good kimchi out of them. Sorry I couldn't include pics of the plants as I most have deleted. But with 2 years of success (in spite of user error), this is definitely a great selection.
- NancyRated 5 out of 5 stars10/25/245 Stars
This is the first time I have grown this Napa Cabbage. Planted seeds Sept 3 in the Atlanta area and as the package said, I am harvesting BIG cabbages about 50 days later. I am searching for stuffed cabbage recipes as I need to use what I don't end up sharing with neighbors. Will definitely grow this seed again in the spring.
Which best describes you as a gardener? Beginner - Freda T.Verified BuyerRated 5 out of 5 stars8/25/245 Stars
Were growing well a week ago before I got sick. I don't know about now since I have been in n the hospital. I have not seen them.
Which best describes you as a gardener? Intermediate