Where to buy seeds
Some links are affiliate links — Verdantly may earn a commission at no cost to you. Learn more.
Early Mibuna Mustard is a Japanese heirloom green that brings authentic flavor to your garden in just 40-49 days. This tender, cold-hardy annual produces distinctive smooth, pointed leaves with a gentle mustard kick that sets it apart from its mizuna cousin. Growing to 18-24 inches in full sun across zones 2-10, it thrives in moderate moisture and slightly acidic soil, making it accessible to gardeners almost anywhere. The variety takes its name from Mibu, a prefecture in Kyoto where it has been cultivated as a traditional dento yasai (heirloom vegetable) for generations.
Full Sun
Moderate
2-10
24in H x ?in W
—
Moderate
Hover over chart points for details
This is mustard for people who don't think they like mustard. The flavor is mild and refined, with a peppery warmth that arrives on the finish rather than hitting you upfront. The leaves are smooth and pointed, giving it a more delicate appearance than the feathery mizuna, and they're tender enough to eat raw in salads when young or to cook down like any quick-cooking green. It crosses the threshold from cool-season crop to warm-season possibility, so you can sow it in early spring and again in late summer for extended harvests.
Young leaves work beautifully in salads, where their mild flavor and tender texture shine raw. As the plant matures, the leaves become ideal for stir-fries, sautés, and light cooking, wilting quickly into a nutritious green side dish. The entire plant is edible, and many growers enjoy harvesting outer leaves continuously while allowing the center to keep producing, extending the harvest window well beyond the initial 40-49 days to maturity.
No timeline data available yet for this variety.
Start seeds indoors 4-6 weeks before your last spring frost, keeping soil at 55-70°F. Transplant seedlings into individual cells once they develop true leaves, and harden them off for 7-10 days before moving outdoors.
Transplant hardened seedlings outdoors after the last frost, spacing them 6 inches apart in rows 8 inches apart. For fall crops, transplant in late summer to harvest before hard freezes.
Direct sow seeds outdoors in spring after soil reaches 55°F, or in late summer for fall harvest. Sow at the spacing indicated above, thinning seedlings to proper distance as they emerge.
Begin harvesting outer leaves when plants reach 4-6 inches tall, typically around 25-30 days after germination. Pinch or cut leaves from the outside of the plant, working inward, to encourage continued growth from the center. For the most tender leaves, harvest in the morning after any dew has dried. The entire plant can be harvested at maturity (40-49 days), or you can take individual leaves continuously for 4-6 weeks of extended production.
Enter your ZIP code to see a personalized growing calendar for this plant.
“Early Mibuna Mustard carries the heritage of Mibu, a region in Kyoto Prefecture, Japan, where it has been grown as a traditional dento yasai for centuries. These heritage vegetables hold deep cultural roots in Japanese agriculture and home gardening, passed down through families and communities. The variety represents a living connection to Japanese culinary tradition, preserved and now shared with gardeners worldwide through the seed saving and heirloom movement.”