- G. M. Whitney & Co. (1)
- Galloway Bros. & Co. (10)
- Galloway, Suzanne (4)
- Garber, Marilyn A. (1)
- Gardner Nursery Co. (1)
- Gause, G.R. & Co. (2)
- Geo. Moulson & Son, Union Nurseries (1)
- Gerard, John (165)
- Gilbertson Seed & Herb Co. (1)
- Globe Nurseries (1)
- Goltz, Howard (1)
- Goltz, Janet (5)
- Grand Forks Seed Co (1)
- Gray Floral Company (1)
- Greening Nursery Company (6)
- Gregory Fam Seed Co (1)
- Gregory Farm Seed Co (1)
- Griswold Seed & Nursery Co. (W) (4)
- Griswold, Robert S., Seed & Floral (8)
- Grossenbach, A. & Co. (2)
