Ryan Simpson designed Swansea's Peter Pan Inspiring Space, while Tara Maloney (Osterley), Vanessa Smith (Morden) and Alex Higgins (Weybridge) designed a pre-historic garden. Both sites raised money for Greenfingers.
Smith said the firm had been on a drive to improve the overall plant quality this year. "Bedding quality has improved. We are told not to accept any rough plants. This has been drummed into suppliers.
"Our prices have gone up slightly to £3.49 for bedding - but no-one has said anything. It is all about maintaining the quality."
GCG's Church Lawford Nursery & Garden Centre also created an 'Owl and the Pussycat' design. Around 200 GCG planteria and other managers met at the National Plant Show last month to discuss planteria sales strategies.