Richard Beales was the last member of the Beales family still working within the company. Peter Beales died in January 2013 and his daughter Amanda died soon afterwards, as did his wife Joan.
Peter Beales Roses continues to be in business and a company spokesman insisted: "Peter Beales' legacy will continue".
The company added that Richard Beales "hopes to find peace and happiness away from the commercial pressures of the company".
The Norfolk-based business redeveloped its gardens in 2014 and has plans to develop its breeding and marketing of new varieties.