VegetableCabbage
Osaka Shirona Chinese Cabbage
Osaka Shirona is a loose-leaf Chinese cabbage that bridges two vegetable worlds, possibly descended from a cross between traditional Chinese cabbage and pak choi. Fast maturing in 40-49 days, this annual grows to 12-18 inches tall and thrives across zones 2-10, making it one of the few brassicas that handles both cold snaps and summer heat with equal poise. The shirona group is prized for its attractive, open foliage that can be harvested leaf by leaf from microgreen stage onward, offering flexibility that headed varieties simply cannot match.
Photo © True Leaf Market
Growing Conditions
USDA Zone
2-10
Sunlight
Full Sun
Water
Moderate
Soil
Well-drained Loam, Tolerates Poor Soils
Growth Stats
18 in
Height
Spacing
18
Plant Profile
Sunlight
Full Sun
Water
Moderate
Zones
2-10
Size
18in H x ?in W
Growth
—
Care
High
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Highlights
Osaka Shirona tolerates an unusually wide temperature range, staying productive through spring frosts and summer warmth that would bolt many other Asian greens. Its loose-leaf habit means you're not waiting for a tight head to form before you can start harvesting; pick outer leaves as needed or gather the whole plant at maturity. At 40-49 days to harvest, it fits easily into succession plantings or fills the gap between spring and fall crops.
Common Uses
Osaka Shirona works as a fresh salad green, a sautéed side dish, or an addition to stir-fries where its tender leaves cook down quickly. The loose-leaf structure makes it more tender than headed Chinese cabbage varieties, so it's excellent for raw preparations. Its ability to be harvested at the microgreen stage through maturity means home gardeners can use it fresh at virtually any growth phase.
Growing Timeline
No timeline data available yet for this variety.
Care Instructions
Direct Sow
Direct sow seeds outdoors in spring after the last frost, or in late summer for a fall crop. Osaka Shirona germinates quickly and grows fast, making direct sowing practical for most gardeners.
Harvesting
Begin harvesting outer leaves once the plant reaches 6-8 inches tall, pinching them off at the base to encourage continued growth. For a full plant harvest, cut at ground level when leaves are tender and before any bolting occurs. The microgreen stage offers delicate, mild leaves for salads, while mature plants deliver more robust flavor. Osaka Shirona can be picked continuously throughout its season or taken all at once, depending on your needs.
Growing Calendar
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Companion Planting
Ecology & Traits
Edible
Scientific Classification
Brassica rapa Pekinensis 'Osaka Shirona'
Family
Brassicaceae
Genus
Brassica
Native Status
L48 (I)AK (I)HI (I)CAN (I)GL (I)
History & Origin
“The shirona cabbage group represents an intriguing chapter in Asian vegetable breeding, one that may trace back to crosses between Brassica rapa var. pekinensis (Chinese cabbage) and pak choi, though some sources suggest kinship with komatsuna. Osaka Shirona emerged from Japanese horticultural selection, refined through decades of cultivation in regions with temperamental growing seasons. The variety carries the practical wisdom of growers who needed crops that could handle unpredictable weather without sacrificing quality or speed.”