Dave's Garden. Search the extensive PlantFiles database.
Links for Allium -
Rainy Side Gardeners: Allium 'Globemaster' - Plant profile compiled by two gardeners in the Pacific Northwest. Includes propagation and pruning methods, and commentary. (zone 6-10) (4 photos)
Rob's Plants: Allium 'Oma' - Plant profile with basic horticultural information and often personal observations. Also seed germination records.