He said: "There were some garden centres we'd have hoped to have been there that maybe weren't. It could have been they were not in a postion to buy, or they could have owed suppliers a bit of money and did not want to be seen buying more, or it could have been because of the awful season.
He added: "A lot of people had a great show but you couldn't get away from the season being bad. The largest concern from the suppliers was lethargy on behalf of the buyers that didn't make it to the show.
"The consensus was there were damn good quality buyers there, but one disappointing thing is that suppliers who tell us they don't need to be at Glee, then spend three days walking the aisles. That's disappointing that they choose not to use it as a vehicle and invest in it and would rather suck time out of buyers that are there by trying to sell in cafes."
Davison said he expects visitor numbers to be down on last year's 11,000 because of the PetIndex section's absence.
He hoped to try and match last year's 1,580 different retailers that attended but said he would be "surprised if we had more".
He said moving to hall 17-20 with outside space at Birmingham NEC was a possibility for the future but the show would run at the same time in 2013 (16-18 September).