VegetableOnion
White Ishikura Onion
The White Ishikura Onion is a Japanese bunching onion that brings elegant simplicity to the winter garden. Unlike traditional bulbing onions, this Allium fistulosum develops long, slender white stalks without forming bulbs, making it a striking and functional addition to cold-climate gardens. Hardy from zones 2 to 9, it reaches harvest in just 60 to 69 days and thrives in full sun. Though technically perennial, it's most often grown as an annual, rewarding gardeners with tender white-ended stalks perfect for fresh harvesting through the colder months.
Photo © True Leaf Market
Growing Conditions
USDA Zone
2-9
Sunlight
Full Sun
Water
Moderate
Soil
Well-drained, Fertile Loam; Tolerates Moderate Fertility
Growth Stats
24 in
Height
Spacing
2
Plant Profile
Sunlight
Full Sun
Water
Moderate
Zones
2-9
Size
24in H x ?in W
Growth
—
Care
High
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Highlights
This Japanese variety earned the RHS Award of Garden Merit for good reason: it's cold hardy enough for zones 2 through 9 and naturally suited to winter harvesting when many other alliums have faded. The long white stalks lack the bulbous base of conventional onions, giving the plant an elegant appearance and making every inch harvestable. It thrives equally well in garden plots, raised beds, containers, and even greenhouses, adapting to tight spacing of just 2 inches between plants while still producing substantial harvests in under 70 days.
Common Uses
The White Ishikura Onion delivers tender white stalks that are harvested and used fresh, either sliced into salads, grilled whole, or chopped into soups and stir-fries. The white portions have a mild, sweet onion flavor when raw or cooked, while the green tops add fresh onion taste to finished dishes. Unlike bulbing onions, every part of this variety is tender enough to eat, making it exceptionally efficient for harvest-and-use cooking where minimal waste matters.
Growing Timeline
No timeline data available yet for this variety.
Care Instructions
Direct Sow
Direct sow seeds outdoors in early spring as soon as soil can be worked, or in late summer for fall and winter harvests. Press seeds into moist soil and keep the surface consistently moist until germination, which typically occurs within 7 to 10 days at moderate temperatures. Succession sowing every 2 to 3 weeks will provide continuous harvests throughout the season.
Harvesting
Begin harvesting White Ishikura Onions when the white stalks reach usable size, typically 60 to 69 days after sowing. Harvest by gently pulling the entire plant from the soil or cutting the stalks at soil level with a sharp knife, leaving the roots to regrow for a second or third harvest. The variety's greatest appeal emerges during fall and winter, when the white stalks become even more tender and flavorful in cool weather. You can harvest individual outer stalks while leaving the center to continue growing, or pull entire plants for a complete harvest.
Growing Calendar
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Companion Planting
Pests & Diseases
Ecology & Traits
Edible
Scientific Classification
Allium fistulosum
Family
Amaryllidaceae
Genus
Allium
Native Status
L48 (I)AK (I)CAN (N)
History & Origin
“The White Ishikura Onion carries its Japanese heritage in its name, part of a long tradition of refined bunching onion cultivation in Asia. The Ishikura type represents generations of selection for the precise trait this variety delivers: extended white shanks with minimal bulbing. Its recognition by the Royal Horticultural Society as a worthy garden plant speaks to the quality of this centuries-tested form, bringing a piece of Japanese horticultural tradition to Western gardens.”