Today I am starting some bunching onion seeds in a 72-cell tray for early spring planting into the raised bed gardens. The seeds I am planting are my favorite spring bunching onion, the Ishikura Japanese Bunching Onion, which I purchased from Baker Creek Heirloom Seed Co.. One of the nice things about this variety of bunching onion is that no matter how long it is allowed to grow in the garden it is still excellent to use in salads, soups, or sautees.
This video will walk through the process of preparing the seed tray, sowing the seed in the tray, covering the seed with vermiculite, and then putting the tray with a humidity dome on the heat mat to start the germination process.
This onion is very quick germinating, usually less than a week, and it is quick growing once it is transplanted into the garden. Once the seeds have germinated, the humidity dome and heat pad will be removed, and the seedlings will be allowed to grow for about a month before transplanting them into the garden.