It is difficult to grow onions in acidic soil. While onions can be started from seeds, it is easiest to use onion sets, which are small dried onions. Yellow Spanish, white, purple, and Dutch yellow storage onions. While the first three varieties will keep 1-2 months, Dutch yellow storage onions are the best for long term winter storage. Planting should occur early in spring t take advantage of the moist soil and the cool weather.
Onions can tolerate some frost.
Plant onion sets in the loose soil with the top half of the set exposed, Plant with the pointed end up. Discard sets that are already sprouting or mushy. As the season progresses, keep onions weed free and moderately well watered. A top dressing of aged compost is beneficial if applied during the first month or so. As Summer begins, the onion tops will yellow,then begin to fall over.