Queen Elizabeth is remembering her beloved late husband Prince Philip on the eve of what would have been his 100th birthday.

The monarch, 95, received a unique, deep pink rose, that was specially created to mark the Duke of Edinburgh’s centenary. And it has been planted in an area of the gardens at Windsor Castle that Philip helped transform.

Philip, who died on April 9, would have turned 100 on Thursday, June 10th – a day the Queen will be spending “privately,” a palace source says.

The rose was presented to the Queen last week by the President of the Royal Horticultural Society, Keith Weed. Upon receiving the flower, the monarch said it “looked lovely.” It has since been given a place in the mixed rose border of the East Terrace Garden at Windsor Castle. Philip played a key role in the layout of the garden, restructuring the flowerbeds and commissioning a bronze lotus fountain which features at its center, the palace says.

“Whilst being very poignant, it was also a delight to give Her Majesty The Queen, Patron of the Royal Horticultural Society, the Duke of Edinburgh Rose to mark what would have been HRH The Duke of Edinburgh’s 100th birthday and to remember his remarkable life,” Weed said in a statement. “The Duke’s devotion to raising public awareness of the importance of conserving the natural world leaves a lasting legacy.”

A royalty from the sale of each rose will go to The Duke of Edinburgh’s Award Living Legacy Fund, which aims to help more young people take part in the Duke of Edinburgh Award.