The link with Springfields Outlet Shopping means the gardens are now open to the public 364 days a year.
It also means the gardens are free to enter.
Springfields Horticultural Society chief executive David Norton says: “It is a significant attraction for the area, but it also keeps us anchored to what we became famous for, tulips and daffodils.”
The gardens still retain the original daffodil collection, with about 250 to 300 varieties of daffodils, as well as the thousands of tulips on display.
Head gardener Andy Boyton works with four other gardeners, as well as volunteers, to keep the lawns and flower beds in perfect condition.
The original head gardener, Jim Jack, will be able to see for himself how the place has evolved as he is one of 100 guests invited to a 50th birthday gala dinner this month. David says guests will be able to share personal memories and reminiscences.
Springfields Horticultural Society has a commercial operation, the events and conference centre, and profits from that also help to maintain Springfields Festival Gardens and keep them free to enter.