Milton Keynes, UK, 2015-5-18 — /EPR Retail News/ — Leading garden center retailer Homebase and Harkness Roses were joined by Macmillan ambassador and classical crossover singer Camilla Kerslake, to launch a brand new variety of rose in aid of Macmillan Cancer Support. The ‘I Am Macmillan’ rose will be available to buy online from September 2015…