Diana, Princess of Wales, who died in a car crash in Paris on August 31, 1997, was laid to rest at the Althorp estate in Northamptonshire, in the east Midlands region of England.
Her brother, Earl Spencer, is now spearheading a move to revamp the estate owned by her family.
A statement on Althorp's website reads: "The Oval Lake where Diana, Princess of Wales, was laid to rest on September 6, 1997, is undergoing an extensive redesign to honour her memory.
It marks the first major revamp of the gardens in 350 years, 'Sunday Mirror' reported.
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The third wife of Earl Spencer, Lady Karen, will be in charge of the project.
Althorp's gardens were first designed by Andre Le Notre, King Louis XIV of France's principal gardener, in the 17th century.
"Please tidy up the vegetation on the island," Diana's personal chef Darren McGrady had tweeted after a visit to the site in 2014.