Show consultant Neil Gow has been visiting growers, tempting them to return with free stand offers at the event, which will use Birmingham NEC's Atrium for the first time to house nurseries.
Gow said free stands and "brilliant" light levels in the Atrium meant every nursery he spoke to was behind the new area. The Atrium will only feature British growers, while overseas growers will be within the main show as usual, he added.
He pointed out that Glee's appeal is that it is "truly national and international" and attracts principals and chief executives rather than just plant buyers.
The revamped area at Glee aims to rival the National Plant Show, which took many of Glee's grower exhibitors when it launched in 2010. Booking starts this week and Gow said: "We expect to run out of space."
Event manager Matthew Mein said Solus could make a return to the trade show and rebookings are 20 per cent ahead of 2013, with the halls 17-20 86 per cent full compared to last year. Bord na Mona is returning, with Scotts, Westland and Smart Solar on the biggest stands.