I love the flowers and buds of chives too more than I like the green leaves and the whole thing dries nicely when cut to size. 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. Sprinkle seeds in the furrows and cover them lightly with more soil mix. 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. Sow onion seeds in average soil in full sun after danger of frost in spring. 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 . Sowing Seed Indoors. 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. Harvesting: Bunching onions can be harvested any time after 60 days; the longer they remain in the ground, the stronger the taste will be. Keep the container in a warm place. Plant the seedlings in your garden after about a month, when all danger of frost has passed. 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. I just bought seed {Heshiko-bunching onion by name} and have never grown them. Growing onions from seed opens up a wide diversity of shapes, flavors, sizes, and colors to grow. Quickly matures and holds well; suitable as scallions or small bulb in spring or fall. Sowing Directly in the Garden . Onion seed may be started indoors in small flats in seed starting mix 6-10 weeks before the last frost. Onions prefer an organic soil that drains well. Evergreen White Bunching onions tolerate cold and light frost, since they are the most cold hardy bunching onion available. Starting from seed typically rewards you with bigger and better quality onions, with larger harvests being a bonus from the abundance of seed in a packet. Label the container with the name of the onion variety. For each leaf, there will be a ring of onion. 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. Bunching onions are very hardy, and many varieties are well-suited to winter harvest or overwintering. 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. Growing onions from seed opens up a world of diversity in shapes, sizes, flavors, and colors to grow. The size of the onion bulb is dependent upon the number and size of the green leaves or tops at the time of bulbing. Selecting Onion Plant Varieties. Onions prefer a pH of 6.0 – 7.0. Onions take a while to develop from seed. Now, a final question. Green onion seeds are slow to bolt and resistant to PR, thrips and smut. Plant Welsh onion seeds indoors in March, using a regular commercial potting soil. Keep moist and maintain a temperature of about 60-65 degrees F. Seedlings emerge in 7-14 days. Sow thinly and cover with ¼ inch of seed starting formula. In frost free areas, sow in fall. 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. The larger the leaf, the larger the ring will be when the carbohydrates from the leaves are transferred to the rings of the bulb. 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