The monarch watched the Duke of Edinburgh Rose implanted in the Windsor Castle gardens last week to commemorate Philip’s centenary Thursday.

She was pictured smiling as she admitted the little rose bush, wrapped in brown paper and twine, in the Royal Horticultural Society’s president.

The rose, which can be deep pink and dappled with white lines, was newly bred following Philip’s departure on April 9 at Windsor Castle.

Keith Weed, president of the Royal Horticultural Society, said the demonstration was”poignant” and a delight as an opportunity to keep in mind the duke’s”remarkable life” within an early conservationist.

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“The duke’s dedication to increasing public awareness of the value of conserving the natural world leaves a lasting legacy,” Weed said in a statement issued by Buckingham Palace.