The new World of Plants at the site will be a redevelopment "of its once-famous but now somewhat old and tired plant sales area", said Malcolm Scott.
He added: "Hayes used to be one of the best-known centres in Britain but it had got tired and old. Most garden centres are getting bigger and bigger and more like John Lewis stores but this is different. It was difficult to get planning permission. It's an exciting design and organic shape although the council needed persuading."
The circular World of Plants plan will create protected sales spaces consisting of a 1,140sq m Open Sky glasshouse to allow the sale of bedding plants throughout the year and a 1,124sq m glazed covered plant sales area for seasonal plant promotions.
A 2,000sq m-plus open area in a half circle lies adjacent to these two protected sales areas and this is accessed by customers under a circular wide canopy.
Adjacent is a 12m-wide canopy, giving complete protection for the sale of hard garden goods - pots, statuary hard landscape products and cold-water aquatics.
In addition, an old and under-used glasshouse building will be entirely redeveloped with a 1,470sq m insulated building for the sale of core garden sundries and a new and exciting aquatic offer. The existing heated retail sales area will be extended.
The gardening greenhouse will become an extension of the covered heated sales area that will house a new aquatic centre and garden sundries sales department.
Hayes will also have a food hall and cafe terrace.