Agriculture Reference
In-Depth Information
Japanese bunching onion seeds
Japanese bunching onions can be propagated by seed or vegetatively by dividing plants.
WHAT YOU'LL NEED
• four or five healthy plants or one dense cluster
POLLINATION NOTES Like all alliums, Japanese bunching onion is an outcrosser, whose white
flowers are visited by many insects. It can cross-pollinate with common onions when they flower at
the same time, though not with leeks, chives, or garlic.
PROPAGATION To maintain multiple varieties, remove flowers and propagate by dividing plant
clusters. Rejuvenate plants every two to three years by digging up, dividing, and replanting at a new
location in the garden. Plants send up flower stalks in the second year, soon after sending out leaves.
Growing from seed is relatively easy, as they grow to ripeness most anywhere.
Hardiness varies by variety, with Asian selections often being hardy only to zone 6 and other variet-
ies being hardy to as low as zone 3. Hoop houses or other season-extension techniques may be neces-
sary to help less-hardy varieties survive the winter in your area.
HARVEST Seeds fall easily from the plant. Harvest and cleaning as for onions.
SELECTION CHARACTERISTICS
• vigorous growth
• fineness of hollow leaves
• production of long scapes (for blanching)
• true-to-type leaf color (white, green, red, violet)
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