Blue Diamond will take over a new £5m, 6,000sqm centre, with builders on the site starting in 2011 and Redfields trading throughout.
Redfields owner Malcolm Goater said: "The family couldn't finance the running of the garden centre and the rebuilding. We were impressed with Blue Diamond's retailing skills so they are taking on a long lease and we are committed to building a new centre as soon as possible."
He added that having fought for planning permission over a long number of years, a new site was finally agreed by the planners last summer.
Blue Diamond MD Alan Roper said: "Redfields is a very well run centre with massive potential and when the redevelopment is complete it will be amongst the UK's best centres."
The deal extends Blue Diamond's garden centre presence in the UK to ten centres with a further two in the Channel Islands.
Goater said: "We are very pleased that Blue Diamond will be running the garden centre. They are one of the best operators in the Country and will move the garden centre forwards."
Mike Gilbert of Gilbert Evans acted for Redfields Garden Centre.
Redfields will leave Choice Marketing as a result of the changes.
Goater said: "Both Anne and I have been so pleased to be a member of Choice Marketing during the four years of our membership. The business has benefited enormously from us being a member in terms of rebates, discounts, marketing opportunities, pooling resources and sharing of information.
"Something that is very difficult nowadays for an independent garden centre. On a personal level we have made many friends and we would certainly recommend joining the Group to anyone. The camaraderie is brilliant and it has been a pleasure to be part of a forward thinking and proactive buying and marketing group"
Paul Elding, chairman of Choice Marketing, said "We are very sorry to be losing Redfields from the Group but it will be good to see the new centre finally being built after all their hard work and determination with their local planners. Malcolm and Anne will be sorely missed and we wish them both well for the future".
Choice Marketing, established in 2002, has 25 members within the group with a combined turnover in excess of £60m.