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Onion Seeds, Unzen Early Flat
Description
(Allium cepa). Short day. The ultimate salad onion, this flat white variety is crunchy and juicy and drips with sweet onion flavor. This onion hails from Nagasaki, Japan, and is considered an important variety in Japanese culture and cuisine. Named for a volcano that overlooks Nagasaki, Unzen Early Flat is ideal for snacking, adding to salads, or topping sandwiches. The roots are small, flattened, and perfectly uniform. It is a traditional variety from this famous Japanese city on the island of Kyushu.
- 100-110 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
Unzen Early Flat onions thrive in fertile, well-draining soil with a pH between 6.2 and 6.8. Select a planting site that receives full sun and maintain consistent soil moisture. Mulching can help retain moisture and suppress weeds.
When to Grow
Start Unzen Early Flat onion 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 seed trays or pots filled with damp potting soil. Maintain a temperature of around 60 F. When transplanting seedlings into the garden, space them 4-6 inches apart in rows 12 inches apart.
How to Grow
Onions are sensitive to weed competition; therefore, keep the planting area weed-free by using straw mulch or hand weeding regularly. Regular watering is very important, especially during dry spells, but avoid waterlogging. Interplanting with cabbage relatives can be beneficial, as sulfur compounds from onions may deter pests.
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 Unzen Early Flat onions tolerate frost?
Yes, onions are frost-tolerant and can survive light frosts.
How to cook Unzen Early Flat onions?
This variety is ideal for snacking, adding to salads, or topping sandwiches because of its sweet flavor and crunchy texture.
How do I know when Unzen Early Flat onions are ready to harvest?
They are ready for harvest when the tops turn yellow and fall over naturally. This usually happens 110-110 days after transplanting.
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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