Sowing inside in January or February under growing lights then transplanting to the garden in early spring is the only way that I can grow onions from seed and have them mature in my zone 5 garden. Green onion seeds are slow to bolt and resistant to PR, thrips and smut. Onion seeds can be kept for two years in a cool, dry place such as a properly monitored seed storage box, but fresh first-year onion seeds germinate best. To start onion seedlings indoors in February or March, fill a container nearly to the top with a seed starting mix and then make two furrows, about 1/2-inch deep, for the onion seeds. Evergreen White Bunching onions tolerate cold and light frost, since they are the most cold hardy bunching onion available. Growing onions from seed opens up a wide diversity of shapes, flavors, sizes, and colors to grow. Sow thinly and cover with ¼ inch of seed starting formula. Plant the seedlings in your garden after about a month, when all danger of frost has passed. Onions grown from seed almost always perform better than those grown from sets. Sow onion seeds in average soil in full sun after danger of frost in spring. Onions prefer an organic soil that drains well. Sowing Directly in the Garden . The larger the leaf, the larger the ring will be when the carbohydrates from the leaves are transferred to the rings of the bulb. For each leaf, there will be a ring of onion. Sprinkle seeds in the furrows and cover them lightly with more soil mix. Sowing Seed Indoors. Plant Welsh onion seeds indoors in March, using a regular commercial potting soil. Label the container with the name of the onion variety. You said they {bunching onions} can be used for anything that regular onions are used for. Growers in warmer regions can grow these as well, and are more likely to have success with large sweet onions traditionally grown in winter, like Ailsa Craig and Walla Walla . Keep moist and maintain a temperature of about 60-65 degrees F. Seedlings emerge in 7-14 days. While other types of onions can be marketed in bunches, true bunching onions are cultivars of a specific species, generally Allium fistulosum, though there are exceptions. Quickly matures and holds well; suitable as scallions or small bulb in spring or fall. Germination rates fall as the seeds age, and though I have had three-year-old onion seeds that sprouted well, germination is always highest with fresh seeds. I just bought seed {Heshiko-bunching onion by name} and have never grown them. Planting Bunching Onions. Now, a final question. Harvesting: Bunching onions can be harvested any time after 60 days; the longer they remain in the ground, the stronger the taste will be. Onions prefer a pH of 6.0 – 7.0. In frost free areas, sow in fall. Extra-hardy varieties will normally survive the winter if the soil is well drained. They will be best served by intermediate or day neutral onions such as Valencia or Talon F1, Bandit Leeks and bunching onions like Red Baron and Evergreen Hardy White. SCIENTIFIC NAME: Allium fistulosum CULTURE: Seed can be sown in early spring for summer use, and in July or August for fall and spring use. Award-winning bunching (green) onion with a pungent flavor and compact habit, suitable for containers or the garden. Onion seed may be started indoors in small flats in seed starting mix 6-10 weeks before the last frost. The size of the onion bulb is dependent upon the number and size of the green leaves or tops at the time of bulbing. Bunching onions prefer a soil with a pH of 6.2–6.8. Keep the soil lightly moist until the seeds germinate, which generally takes seven to 10 days. Onions take a while to develop from seed. Work organic matter into your soil at least 6-8 inches deep, removing stones, then level and smooth. 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