Sprinkle seeds in the furrows and cover them lightly with more soil mix. Sowing Seed Indoors. 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. Onions grown from seed almost always perform better than those grown from sets. Plant the seedlings in your garden after about a month, when all danger of frost has passed. Onions prefer a pH of 6.0 – 7.0. I just bought seed {Heshiko-bunching onion by name} and have never grown them. Selecting Onion Plant Varieties. Award-winning bunching (green) onion with a pungent flavor and compact habit, suitable for containers or the garden. 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. Evergreen White Bunching onions tolerate cold and light frost, since they are the most cold hardy bunching onion available. Keep the soil lightly moist until the seeds germinate, which generally takes seven to 10 days. 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. Label the container with the name of the onion variety. Sow thinly and cover with ¼ inch of seed starting formula. Work organic matter into your soil at least 6-8 inches deep, removing stones, then level and smooth. Growing onions from seed opens up a world of diversity in shapes, sizes, flavors, and colors to grow. Park Seed is the source for seeds of this All-America Selection. 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 . Harvesting: Bunching onions can be harvested any time after 60 days; the longer they remain in the ground, the stronger the taste will be. Bunching onions are very hardy, and many varieties are well-suited to winter harvest or overwintering. Keep the container in a warm place. 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. The larger the leaf, the larger the ring will be when the carbohydrates from the leaves are transferred to the rings of the bulb. Onions take a while to develop from seed. Sowing Directly in the Garden . Bunching onions prefer a soil with a pH of 6.2–6.8. 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. Green onion seeds are slow to bolt and resistant to PR, thrips and smut. The size of the onion bulb is dependent upon the number and size of the green leaves or tops at the time of bulbing. In frost free areas, sow in fall. 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. Plant Welsh onion seeds indoors in March, using a regular commercial potting soil. Onion seed may be started indoors in small flats in seed starting mix 6-10 weeks before the last frost. Quickly matures and holds well; suitable as scallions or small bulb in spring or fall. For each leaf, there will be a ring of onion. Onions prefer an organic soil that drains well. Sow onion seeds in average soil in full sun after danger of frost in spring. Now, a final question. Planting Bunching Onions. You said they {bunching onions} can be used for anything that regular onions are used for. 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. 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