The collection consists of 60 linear feet of documents which include John S. Armstrong's memoirs, the Armstrong Nursery journals, ledgers, harvest books, diaries, maps and catalogs. There are also approximately 4000 photographs, 10,000 negatives, audio tapes, 16mm films and photographs of discontinued roses. The diaries contain the notes of hybridists Walter Lammerts, Herbert C. Swim, David L. Armstrong, and Jack C. Christensen written during their tenure in Armstrong's Research Department. Dr. Lammerts' notes on the hybridization of the Charlotte Armstrong Rose (Ontario's official flower) and Mr. Swim's notes on his prize-winning roses are included. These diaries date from 1938-1970.