Ishikura Long White

Family: Amaryllidaceae Vegetable

Sweetly mild and vividly fresh, Ishikura Long White delivers long, tender white shanks with a crisp, juicy bite and a clean allium perfume that stays bright rather than sharp.

The slender, cylindrical form is especially prized for its pale, delicately layered texture—ideal for showcasing in fresh preparations, quick stir-fries, and silky sauces where its gentle flavor shines. Grow with confidence for a steady harvest rhythm around 60 days, when the greens stand tall and the white portion is at its most succulent.

Light: Full SunMaturity: 60 DaysHabit: Upright

Botanical illustration of Ishikura Long White

Planting schedules and alerts are optimized for Columbus (Zone 6b).

Crop Dates

Milestone	Date
Start Indoors	Direct Sow
Last Frost	Apr 25th
Transplant / Sow Outdoors	Apr 25th
Harvest Begins	Jun 24th
Harvest Ends	Oct 16th

Crop Details

Trait	Value
Days to Maturity	60
Sun Requirements	Full Sun
Growth Habit	Upright
Support Needed	None
Planting Depth	Normal
Germination Temp (°F)	65
Min Soil Temp (°F)	45
Min Night Temp (°F)	35
Harden Off (days)	Not Required

Culinary Notes

Chef's Note

Ishikura Long White is mild enough to eat generously raw, but it still brings that crisp, watery snap and a bright allium perfume that doesn’t turn aggressive in heat. The long pale shanks caramelize faster than you’d expect, so it’s tailor-made for quick wok work and sauces where texture matters.

Best Uses

thin-sliced raw over hot rice or noodles so they stay snappy
quick stir-fry where the white part caramelizes lightly while the green stays fragrant
silky sauce or soup bases—blend/simmer briefly, then adjust for brightness
grill or sear in long strips for charred edges and sweet, tender centers

Flavor Profile

sweetly mild allium crisp, juicy bite clean onion perfume tender pale shank with a delicate crunch

Kitchen Pairings

soy sauce ginger garlic sesame oil rice vinegar chicken or pork

Frequently Asked Questions

How do I prevent and treat onion-family diseases like downy mildew and rust when growing Allium fistulosum (Ishikura Long White)?

Watch for pale, elongated leaf spots and a downy gray-purple growth on the underside of leaves—these are common in humid weather. Remove badly affected clumps early, improve airflow by thinning to about 6–10 cm (2–4 in) spacing, and water at the soil line so foliage stays dry. If rust-like orange pustules appear, cut off and discard infected leaves promptly and avoid overhead watering for the rest of the season.

How often should I water Ishikura Long White during the main growing phase to keep Allium fistulosum happy?

During active leaf growth, keep the top 2–3 cm (1 in) of soil consistently moist but not soggy—typically about 2.5 cm (1 in) of water per week, adjusted for rainfall and heat. Water deeply, then let the soil surface begin to dry slightly before the next watering to reduce rot risk around the shallow roots. If tips look limp during warm afternoons but recover overnight, increase watering frequency rather than total volume.

When is Allium fistulosum (Ishikura Long White) ready to harvest, and what signs should I use?

Harvest at around 60 days when the leaves are fully formed and the plants are thick enough to feel substantial, typically 25–35 cm (10–14 in) tall. Choose either a “cut-and-come-again” harvest by trimming outer leaves, or lift entire clumps once they’ve built good density. If leaves start to look overcrowded and thinner than pencil width, harvest promptly to maintain tenderness.