Atlas Greenhouse Systems, Inc.

Ball Seed Company 

McHutchison

Blackmore Co. (Transplanters, etc.)

Burpee Seed Company

Eason Horticultural Resources

Emerald Coast Growers

Expresss Seed Company

Fafard Company

The Flower Fields

Germania Seed Company

GM Pro Magazine (for Growers)

The Art & Science of Goldsmith

GreenDex (info sharing site) 

Greenhouse Grower

Griffin Greenhouse Supply

Grimes Seed

Growlink Mums

Harris Seeds

Hort. Products & Services Seeds

ITML, Inc. (Containers) 

Jelitto Perennial Seeds

Macore Labels

MasterTag (Labels)

Michell's Seed Co.

Oglevee (Geraniums, etc.)

PanAmerican Seed

Park Seed

Park Seed Wholesale

Seedway Seeds

Scotts Company

Stokes Seeds

Syngenta Seeds (S&G)

Wave-Rave.com

XS Smith

Yoder Brothers