i'll offer 1 word of caution - DO NOT plant them close together in the garden. pushing each other apart is NOT a good idea.
i used to space different varieties at 3" and i'd get small onions. when i went to 4" the bulbs (same varieties) incresed quite a bit in size. crowding the plants will give smaller bulbs.
for giant onions like ailsa craig exhibition and candy use 6" even 8" spacing for good sized bulbs.
tom
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