Onion Unzen Flat

Onion Unzen Flat Seeds: Crunchy Salad Onion from Japan

Discover the exceptional Onion Unzen Flat (*Allium cepa*), the ultimate choice for salads!

This flat, white onion variety from Nagasaki, Japan, offers a delightful combination of crispness, juiciness, and a wonderfully sweet onion flavor. Highly valued in Japanese culture and cuisine, and named after a prominent volcano, Unzen is perfect for snacking, adding a refreshing crunch to salads, or topping your favorite sandwiches.

Its small, flattened roots are remarkably uniform. This is a traditional and celebrated variety from the island of Kyushu.

Key Features of Onion Unzen Flat

• Ultimate Salad Onion: Sweet, crunchy, and juicy with excellent flavor.
• Flat White Variety: Distinctive flattened shape and white color.
• Japanese Heirloom: Hails from Nagasaki, Japan, a culturally significant variety.
• Versatile Use: Ideal for salads, snacking, and sandwiches.
• Uniform Roots: Produces small, consistently shaped bulbs.
• Short Day Onion: Best suited for regions with shorter day lengths during bulb formation.

Growing Your Onion Unzen Flat

Onions are typically started indoors 8-12 weeks before the anticipated planting-out time, usually around 3-4 weeks after the last frost in cooler climates. Sow seeds 1/4 inch deep.

Maintain an ideal germination temperature of 45-80°F, with sprouts appearing in 7-14 days. Transplant seedlings outdoors into rich, moist soil, spacing them 4-6 inches apart in a location that receives 6-12 hours of sun daily.

Unzen Flat onion is frost hardy, allowing for planting in early spring or even late fall in some regions.