The venture aims to build on the success of Leekes' first conservatory and glazing concession at Henry Street Garden Centre in Reading, which opened in June 2007.
Leekes commercial director Emma Leeke said:
"This is an exciting time for the business, allowing us to grow our catchment area further into the South West to meet increasing customer demand for quality conservatory, glazing and kitchen products.
"We believe that the trend for people improving their homes instead of moving house will continue into 2009."
Last autumn the Leekes Group announced a £37 million funding agreement with Barclays Bank to support the growth of its retail operation, as well as the hospitality and leisure sector of the business, the Vale Hotel, Golf and Spa Resort.
Leeke said: "In the current climate it is important to reassure existing and new customers of the stability of our business and there's no better way to do this than via growth and expansion."
Wyevale marketing and events manager Natalie Moulden said:
"We are pleased to have reached an agreement with Leekes to have concessions at three of our garden centres in the South West - Sanders GardenWorld at Brent Knoll, Somerset, Thornbury Garden Centre near Bristol and Swindon Garden Centre."
Wyevale managing director Nicholas Marshall is known for his keenness on franchises. See the interview with Marshall in Garden Retail, out on 23 January.