In 1994, Molloy was appointed managing director and has held the role since then. He will continue to support the business on a consultancy basis going forward.
Leisuregrow Group has appointed James Spillane as Molloy's successor. Spillane has more than 20 years of national and international experience in the food and horticulture industries. Most recently he held a senior commercial role at Valeo Foods and previously was commercial manager at Bord na Mona.
Group chief executive Richard Grimmer said: "John has seen the business through thick and thin and has always delivered on his commitment to quality and reliability. Our horticulture business is a strategically important part of Leisuregrow Group. I am delighted to announce the appointment of James as managing director. His breadth of experience will be invaluable to us as we seek to grow and develop the business."