Around 200 staff with at least 10 years service attended a retirement lunch on Tuesday, with those at the event having more than 4,000 total years experience.
Notcutt, who is president of the family firm, which now consists of 19 garden centres, will take an honorary role, write a book about Notcutts and travel more, particularly with the Dendrological Society.
Notcutts representative Sally Reed said: The business has changed dramatically since he was fully involved. It was his choice to retire.
Notcutts bought six NWF centres this month after having sold its nursery and tree growing arms and pulling out of garden design in recent years.