Exhibition growers sow their onions as early as Christmas. Sow the seed indoors in a modular tray filled with a Best Buy compost for sowing seeds. Grow them in a well-lit, frost-free place until ...
Planting onions from small bulbs or "sets" is not the best way to grow large onions for storage. Plants grown from sets often begin blooming in mid-summer and stubbornly refuse to stop.