Glee 2013 (15-17 September, NEC Birmingham), attracted 7,600 visitors this year, down from 9,800 in 2012.
Director Matt Mein said: "We were pleased but what we need to do is understand the market now."
He said, for instance, Garden & Leisure sent 15 staff on 2013 but after being bought by The Garden Centre Group that could change in 2014. He said this year's Sunday opening experiment needed more analysis after exhibitors reported a quiet day.
In total 472 suppliers exhibited at the 2013 show, including over 160 brand new exhibitors to Glee, as well as 69 international exhibitors.
Third-thirds of attendees had direct buying responsibility.
Over 1,800 representatives from independent and multiple garden centre retailers, including all but two GCA members, also attended the show across its three days.
Together this garden centre audience made up over 24% of the show’s overall audience, matching 2012’s visitor breakdown.
Key garden centres in attendance were Aylett Nurseries, Barton Grange Garden Centres, Bents Garden Centres, Blue Diamond, Chessington Garden Centre, Garden & Leisure, Golden Acre Nurseries, Hayes Garden World, Hilliers Garden Centres, Hilltops Garden Centre, Scotsdale, and The Garden Centre Group.
Multiple retailers represented 350 visitors including B&Q, Countrywide, Homebase, John Lewis, Lakeland, Marks & Spencer, Morrisons, Ocado, QVC, Sainsbury’s, and Tesco.
Some 26 per cent of visitors had never before visited the show.