How do you grow large sweet onions? [View all]

I usually grow Walla Walla and Texas Sweet. I plant them in a raised row and spaced with enough room to grow large. I fertilize with 10 10 10 and cow manure. When the onion starts growing I pull back the soil around the bulb. The only thing you want in the soil are the roots and the bottom part of the bulb. Removing soil around the bulb allows the onion to grow unrestricted and larger. Walla Walla is a delicious sweet onion but I don't think they store as good as Texas Sweet.