- Baldwin Nursery (5)
- Baldwin-Whitten-Ackerman Nurseries (2)
- Balslev, Vilhelm (2)
- Barnes Brothers Nursery Co., Inc. (2)
- Barteldes Seeds (16)
- Bassler & Bro. (1)
- Batavia Nurseries (Nelson Bogue) (1)
- Beadle's, D.W. (17)
- Beatrice Nursery & Sonderegger Seed (16)
- Berlin, Nancy Lizette (1)
- Berry Seed Company (19)
- Bloomfield Nursery Co. (1)
- Brainerd Nursery (1)
- Brand Nursery Company (3)
- Brockman, Wendy (6)
- Bronson, Hopkins & Co. (1)
- Brown Brothers Co. (1)
- Brown Brothers Co. (Continental Nursery) (1)
- Brown Brothers Company (1)
- Brown County Seed House/Trent, S. G. (1)
