Colleagues and customers at Notcutts Garden Centre located in Nuneham Courtney (Oxfordshire) have raised over £1,000 for Thrive.
The money was raised by hosting a series of flower arranging masterclasses which attracted almost 200 people.
Notcutts centre manager Jonathan Tew said; "I am delighted that our flower masterclass events were such a success.
"Not only were they lots of fun but they also raised money to support the incredible work that Thrive do. Gardening is a fantastic hobby and for many people can help improve their physical and mental health in a very positive way."
Kathryn Rossiter, CEO of Thrive, said: "Thank you very much to Notcutts for this wonderful donation. The money will be spent on supporting our client gardeners and I am delighted that Notcutts have been able to see us in action when they visited our gardens at Beech Hill to make the donation and were given a tour."
Notcutts has supported Thrive for two years through a range of fundraising activities at all 18 centres nationwide, as well as through the Charles Notcutt Memorial Bursary which enables students to complete an Award in Social and Therapeutic Horticulture.
Kathryn Rossiter, CEO of Thrive is pictured, (back row, second from left) with Jonathan Tew, Notcutts Oxford Centre Manager and Sam Mallett, Notcutts Oxford Outdoor Manager Thrive client gardeners Aaron, Amelia and Emma.