An internal restructure of the retail division for William Sinclair sees Danny Adamson quit as managing director.
Mr Adamson has been with the company for six years and during that time has made considerable contributions to the business.
Speaking about his time at William Sinclair, Mr Adamson said: "I have thoroughly enjoyed my time at Sinclair and have relished working within the horticultural industry. Our division has made some excellent progress over the past six years and is now well placed to take the next step. There is an impressive team in place at Sinclair and I wish them all the very best for what should be a very exciting future."
Chief executive of William Sinclair, Peter Rush, said: "Danny has been instrumental in making Sinclair a well-respected and progressive horticultural business, one that is seen as being good to do business with. As a result, the business has grown and also expanded into new categories. We thank Danny for this and wish him every success in the future."