The former horticultural science curator at the Eden Project Dr Alistair Griffiths has been named as the new head of science at the RHS.
Griffiths, who will take up his role with the RHS on 20 May, spent a decade at the Eden Project.
Acting RHS head of science Dr John David will return to his previous role as RHS chief scientist.
He was covering for Dr Roger Willliams, who left last year to work for the New Zealand crops levy board.
Dr Griffiths obtained a First and National Diploma in Horticulture while at Myerscough College and obtained a BSc (Hons) in Botany, and a PhD from the University of Reading.
He is currently a Visiting Lecturer at Reading University, and a Trustee of both Plant Network and People & Gardens CIC (Community Interest Company).
Griffiths said: "I am excited about working with everyone at the RHS and others in the horticulture world to raise the profile of horticultural science. I look forward to leading scientific research that will provide members and gardeners with information to create beautiful, sustainable gardens that maximise environmental benefit and human wellbeing."
RHS director general Sue Biggs said: "We are delighted to have Alistair join the RHS as the new Head of Science and to be a member of the Leadership Team.
"His wealth of horticultural science experience and the skills he developed at the Eden Project will benefit our extensive ambitions for science going forward.
"Alistair will be leading a team of talented and motivated scientists, and together will help our members and gardeners face an ever-changing horticultural and environmental world.
"I'd also like to take this opportunity to thank Dr John David for his brilliant work as acting head of science. His knowledge, skills and experience have meant the RHS has enjoyed a seamless transition between the two permanent heads of science, and I know he is longing to get back to his scientific research."