Wilson will join Conceptual Gardens director Tony Heywood and Chris Young, deputy editor of the RHS Garden Magazine, to examine the designs.
Three designs will be chosen to exhibit at Tatton Park next year on 21-25 July and the best will win the title of RHS Young Designer of the Year for the creator.
Wilson told HW the competition would provide a platform for those wishing to enter the industry and to help encourage new designers into the sector.
"It should be quite interesting because it gives them access to producing the garden they want," he explained.
The RHS competition was aimed at designers and students aged 28 and under. It closed to entries on Monday (14 December).
The three designers chosen for Tatton Park will receive £12,000 each — funded by the RHS and the North West Regional Development Agency — to create their garden.
"We've had a good bunch of entries," added Wilson. Around 20 young designers submitted garden designs to the competition.