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Onion Seeds, Ishikura Bunching
Description
(Allium fistulosum). A uniform and flavorful bunching onion, that is a popular and traditional Japanese variety for sukiyaki, soup, and salads. Ishikura reaches enormous proportions (up to two feet tall, one inch across) while remaining tender and scallion-like, never forming a bulb. A perfect heat- and cold-tolerant green that is a go-to choice to grow alongside Asian greens in the cool season! No garden should be without this easy-to-grow culinary staple!
- 40-50 days to maturity
- 6-12 hours of full sun
- Sprouts in 7-14 days
- Seed Depth: 1/4"
- Plant Spacing: 4-6"
- Ideal Temperature: 45-80 F
- Frost Hardy: Yes
Growing Tips, Tricks and FAQs
Growing Tips
The Ishikura Bunching onion is a hardy Japanese heirloom variety that thrives in full sun. As all onions, it requires well-draining, rich, and fertile soil. Regular watering is also important to ensure tender stalks while adding mulch can help retain moisture and reduce weeds. Unlike bulb-forming onions, Ishikura grows as a bunching, non-bulbing type.
When to Grow
Start seeds indoors three months before the last expected frost date in spring. Onions begin slowly, so this early start allows for adequate growth before transplanting. Transplant acclimated, stocky seedlings into the garden 4-6 weeks before the last frost of spring, as onions can tolerate light frosts.
How to Sow and Plant
Sow seeds 1/4 inch deep in rows or clusters, keeping the soil temperature at around 60 F. Thin seedlings to 4-6 inches apart, or plant more densely if harvesting as young scallions. Keep rows 12 inches apart for proper spacing.
How to Grow
Feed with a balanced fertilizer every 3-4 weeks for the best growth. Keep soil consistently moist but not waterlogged. Weed regularly to minimize competition, as bunching onions do not compete well with other plants. Harvest the green stalks as needed, cutting them at the base to encourage regrowth.
How to Save
- Onions will cross with other onions, and occasionally they will cross with scallion types like Welsh onions and Hi Shi Ko bunching onions. Onions will never cross with leeks, chives or garlic.
- If you are growing types that will cross, try to isolate varieties by at least several hundred feet or ideally up to one mile.
- Onions are a biennial seed crop, so you will need to overwinter your first-year roots, ideally by digging them up and storing them for the winter. Replant in early spring, and allow onions to shoot up spikes of purple flowers.
- Let seeds become dry on the plants. Pick seeds when they are hard and dark black, then bring them indoors to finish drying.
- Once dry, separate the seeds from the husks or leave them on and plant them husks and all.
FAQ
Can Ishikura Bunching onions grow in containers?
Yes, they grow well in deep containers as long as the soil is nutrient-rich and moist.
Are Ishikura Bunching onions perennial?
While typically grown as an annual, they can be managed as a perennial with proper care, as the stalks regrow after cutting.
How to use Ishikura Bunching onions in cooking?
They are great for adding a fresh, mild onion flavor to soups, stir-fries, or as a garnish for dishes like ramen or miso soup.
How do I determine day length and first-last frost in my area?
Check out our blog post: Our Experts Answer Questions, Share Resources for links to online guides.
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