According to Express, Catherine designed the Back to Nature Garden - which first debuted at the RHS Chelsea Flower Show earlier this year.
Kensington Palace shared the following post about the Back to Nature Garden on their Instagram account:
"Over the past months, Prince George, Princess Charlotte and Prince Louis have helped The Duchess gather moss, leaves and twigs to help decorate @The_RHS Back to Nature Garden," read the caption, indicating that William and Kate's children had been involved in the design of the garden.
Express reported that the garden will have a 'bouncing forest' of trampolines surrounded by trees and a living willow pod.
The Duchess collaborated on the design of the garden with the Royal Horticultural Society and Davies White Landscape Architects.
"The Back to Nature festival is a fitting finale to a project I have been thrilled to be part of," Kate said at the event, according to the publication.
"It has been the most amazing experience and I can’t thank the RHS enough for giving me this wonderful opportunity."
Other new features included a treehouse and a hedgehog-inspired shape for children to enjoy.
"I am not as green-fingered as many of you here, but I was passionate about creating a garden that inspired children and adults alike to get back to nature and reap the positive mental and physical health benefits that it can bring," she added.
The Wisley garden is located in Surrey and is one of five gardens run by the Royal Horticultural Society.