The Charles C. Plitt Collection consists of a series of journals resulting from weekly botany field trips, which Plitt referred to as "tramps," ranging in date from about 1898 to 1922. Plitt led these tramps through many areas around Baltimore, such as Loch Raven, Glen Burnie, Towson, Curtis Bay, and Ellicott City. The collection also includes biographical data, correspondence, photographs, and a book.

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.