The American Seed Trade Association Photograph Collection contains matted group photographs from various United States seed trade association meetings. Persons in photographs are not identified. Seed trade associations represented are as follows: American Seed Trade Association, the Atlantic Seedmen's Association, the California Seed Association, the Pacific Seedmen's Association, and the Western Seedmen's Association.

The Grant Thorburn and Sons Invoice Book is a 50-page volume containing invoices for flowers, trees, and seeds related to business transactions of the Grant Thorburn and Sons seed company.

The M. Truman Fossum Floriculture Collection include Fossum's business and personal correspondence, as well as reports and publications related to marketing, horticulture, and the floriculture industry in the United States and abroad.

The Oscar Clemen Stine Papers are handwritten and typed notes on wheat history, colonial wheat culture, wheat exports and imports, insects and diseases, business and wheat crops, acreage, consumption, demand, and foreign markets. Additionally, there are publications by Stine and a manuscript of his autobiography, "Reminiscences of O.C. Stine."

The Philip Vincent Cardon Papers include correspondence, newspaper clippings, photographs, reprints, unpublished lectures and research papers, outlines and notes for radio talks and skits, and some memorabilia.

P.J. Berckmans Company Records contain an inventory of the nursery stock at Berckmans' Fruitland Nurseries dated 1918, purchase and shipping orders, a private letter, covers of catalogs, and a number of photographs of the nursery stock.

The Prince Family Papers contain correspondence, account books, notebooks, and journals that provide an insight into the difficulties of maintaining a large nursery in the early years of the United States. Much of the material concerns business dealings between members of the Prince family and those transacting business with them. The remaining portion of the material deals with observations on and experiments with plants.