The British Franchise Association's Franchisor of the Year Awards recognise exceptional levels of insight and investment in core areas of business.
GreenThumb managing director Jeff Williams said: "Winning the brand-builder category is a tremendous honour for us. It is recognition and confirmation from industry experts that our business, and our brand, is at the forefront of franchising in this country."
Williams said he hoped the award would help the company to maintain rapid growth.
He said: "When we started franchising in 1995 we had 8,000 customers. Now we have 380,000 and 189 locations nationwide. Awards like this do make a big difference. The business we are in is selling franchising, so it gives people confidence in our business system."
The company scooped the award with a new advertising campaign which moved away from traditional logos for lawn care and incorporated cartoons and 3D animations.
The result has been increased turnover month on month throughout 2008/09, peaking with 3.7 per cent national growth in April 2009.
Express Newspapers advertising group head Geraldine Haenow said: "GreenThumb has shown real credence and has successfully built a reputable brand within the franchise industry over the past 12 months. Through ambitious planning and successful promotion, GreenThumb has constructed a reliable platform for success, and I'm sure this will accelerate its business to tackle the current unstable economic market head on."
Subscribe to Horticulture Week for more news, more in-depth features and more technical and market info.