Growers at the show, held at Roundstone Nurseries near Chichester, were upbeat despite caution among retailers meaning orders are coming in later.
Syngenta sales representative Pete Gillman said: "People are ordering later, which is not surprising, but they will need plants. There will be a late surge."
Fargro managing director Jim McAlpine said: "Next year could be a good one for the industry. Growers have been cautious but if the weather is with them they could do very well."
He added: "We're happy with the turnout at the show and we have found it worthwhile."
Roundstone Nurseries managing director Peter Cook said: "An encouraging sign is the upbeat mood, and you get that as soon as you walk through the door, I think. A negative mood would have been counter productive."
Show organiser Sarah Jane Milbourn said visitor numbers were up. "Online registrations were up from last year, and stands are up by 7 per cent. Everyone has been positive."