Dr Barrie Machin started growing chrysanthemums more than 70 years ago, when he was 11, and studied chrysanthemums all his adult life. He was awarded the RHS Gold Veitch Memorial Medal for his work on AYR cut-flower chrysanthemums, and was a member of the RHS Chrysanthemum Committee for many years.
Garden writer Peter Seabrook said: "I knew him as one of the lead characters on the South Coast involved with chrysanthemum production."
The National Chrysanthemum Society said: "Barrie was always willing to give advice on cultivation of the chrysanthemum and had written many articles for NCS publications and wrote the book Understanding Chrysanthemums for the NCS. He was awarded Honorary Fellowship of the Society at the recent Honours Committee meeting in recognition of his long service to the Society and the chrysanthemum."
Chrysanthemum grower Colin Frampton said: "Barrie was one of the earliest and most enthusiastic proponents of the all-year-round chrysanthemum growing technique. In the early 1950s he wrote his PHD thesis on the control of chrysanthemum flowering and subsequently wrote several books (some with Sydney Searle) on all aspects of the cultivation of AYR chrysanths. His breeding work became world famous with many outstanding pot and cut flower varieties. His classic outstanding varieties included Yellow Snowdon, Pink Gins and Frescos. His great enthusiasm led him to speaking engagements in many countries and I believe he was particularly popular in Japan."
Machin was author of Chrysanthemums - Year Round Growing in 1978 (with Nigel Scopes).
Without his work on day length manipulation there would be no Chrysanthemum flower industry as it is today.
He also was the author of "The Grower" Chrysanthemum guide in 1983.