Allium cepa Onions are day-length sensitive—to produce large bulbs, plant in spring as soon as soil is workable. Shallow rooted, they require rich weed-free soil and consistent water.
Plant onions 3" apart in rows 1' apart and thin to 6" as they grow. Eat the thinnings as scallions or bulbs, depending on size. If you don’t want to thin, plant them 4-6" apart, and you may have spaces in the row. Mulch when they are 1' tall.
It’s a good idea to sidedress once or twice a season, especially close to solstice.
Clean and grade before storage. Eat double-bulbed onions first because they won’t keep.
Ideal storage conditions are temperatures at 32° with humidity of 60–70%. If you can’t do that, work to get a total number of 100. For example, at temperatures from 50–55°, humidity should be 45–50%.
Approx. 200 onion sets per pound.