More than 30 per cent of the business on show will be from overseas despite the strong euro, and many of them, like Spanish nursery group ASF, have booked more stands this year.
Event organiser Pat Coutts said: "Of the 440 exhibitors, 238 are growers, 129 are UK growers and 41 of those are new exhibitors.
"People like the show because we are cost-effective, they like the site and the show delivers exhibitors the kind of traffic they want. I think it helps that we mail the catalogue so visitors have got time to work out where they want to go."
Late additions to the show include Whiterigg Alpines, which recently came out of administration (see HW, 14 August), Porters Horticultural, Nostell Priory Roses, Hillview Nurseries, Kelly Nurseries, FMK Young Plants, S Lockwood & Son and British Wild Flower Plants.
Highlights of the show include Trolley Net's British growers' lorry display, designed to encourage consolidated deliveries.
The show always features Dutch lorries so Bedford-based Andersons Transport, which owns Trolley Net, decided to organise a British display featuring more than 20 of its growers.
Other highlights include an EPoS system giveaway by TopSys-IT and keynote speeches from John Stanley and John Gillan. Stanley will address the retail day, discussing how to market nursery stock when the rules have changed. Day two, "landscape day", will feature two talks from Gillan on surviving the recession and winning with BALI.