Attendees at the annual event will discuss the question: native or non-native, which is best?
The event, organised and hosted by the Kent nursery is now in its sixth year.
Marketing and sales manager Nick Coslett said that bookings were on track to match last year’s numbers, when more than 300 garden and landscape professionals attended.
He said the choice of theme was partly a response to an upswell of interest in naturalistic show gardens at the RHS Chelsea and Hampton Court Flower Shows.
He added: "There is also an increased interest in planted gardens which attract wildlife and a drive by developers to leave their sites with better biodiversity than before development.
"This is linked to the Code for Sustainable Homes and BREEAM but this can become a point scoring box ticking exercise. The Palmstead Workshop plans to shed some light on this and hopefully some pragmatism too."