A floral tribute to Princess Diana will be called The White Garden.
The garden will be created at her former Kensington Palace home - where her sons Princes William and Harry now live - and planted with an array of beautiful flowers, including white roses, and forget me nots around the current Sunken Garden at the royal establishment.
A spokeswoman for Historic Royal Palaces told the Daily Express newspaper: "The duke and Prince Harry have been supportive. They've seen the plans."
The garden will be ready for spring/summer 2017 and will be open to the public.
Head gardener Sean Harkin suggested installing the memorial in the Sunken Garden because Diana was so fond of it.
The HRP spokeswoman added: "A lot of our gardeners have been here a long time and they remember the Princess and how she particularly liked this sunken garden.
"It was somewhere she used to pass by and have a chat with the gardeners and ask about what they were planting. She took a lot of interest in it."
Sean added: "We hope to capture the energy and spirit which made (the Princess) such a popular figure around the world."
The garden will commemorate 20 years since the Princess of Wales tragically passed away in a car crash in Paris in August 1997 aged just 36.
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