For sets or seed, spacing in the row should be 1 to 2 inches. Transplants should be spaced 2 to 4 inches in the row. How To Plant - One of four general methods may be used. They are listed in order of easy stand establishment. The larger the sets, the sooner the green onions are of market size.
Large sets tend to form seed stalks earlier than smaller sets.
In the early fall and late winter, marketable onions can be produced in 6 to 8 weeks. Plant seed in protected beds in September and set in the field when plants are about 6 inches tall. Seed 12 to 18 seeds per ft of row, in rows 4 to 6 inches apart. It takes about 4 to 6 weeks for the plants to get large enough to set and then an additional 6 to 10 weeks for market size plants. Seed directly in the field in late winter and then thin to proper stand when plants are 2 to 3 inches high.