Adrian Davey from Hozelock will sit on the panel in the place of Scotts vice president Sheila Hill.
Davey is commercial director at the watering firm.
The panel discussion is "all about change" and the "what does the changing landscape mean for garden retail?"
Issues likely to be covered are the economy, product trends, the changing consumer, legislation and innovation.
Matthew Bent, managing director of Bents Garden & Home, Sam Bosworth, director of Choice Marketing and Julian Winfield, chief executive officer of Haskins Garden Centres, are the other panellists.
The panel discussion will be chaired by Horticulture Week deputy editor Matthew Appleby.