The Duchess of Cambridge and celebrity chef Mary Berry launched a new family-friendly garden at RHS Garden Wisley in Surrey.
Celebrity chef Mary Berry, an RHS ambassador, joined the duchess for the event and the pair even travelled on a tractor trailer to a fete-style festival at Wisley that marked the garden's launch.
Kate's new open space - which encourages children to play, explore and engage with nature - has been inspired by previous gardens she co-created with landscape architects Andree Davies and Adam White, with input from the RHS.
In a speech, the duchess told invited families from charities she supports it was an "amazing experience" being given the opportunity by the RHS to help create open spaces at the Chelsea Flower Show and the Hampton Court Palace Garden Festival.
She confessed: "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."
Kate added: "The experiences we gain during our earliest years influence who we become as people. They influence how we interact in school, in work and in society and, ultimately how we bring up our own children.
"Whether it is planting, exploring, digging, creating, or playing; quality time spent outside provides children with the perfect environment to form those positive relationships with the people in their lives and the world around them."
Speaking about her own experiences of being a mother to three small children: "As a parent, I have learnt just how important it is to foster our children's development, in all areas, not just physical, as soon as they are born. We build the blocks, the foundations, for future success and happiness later in their lives."
The Back to Nature garden included elements like the hollow log from Kate's Chelsea Flower Show garden and the wildflower meadow and rolling hill showcased at Hampton Court.
New features include two connected tree houses and slides, which encourage families and friends to have fun together at the garden, which is now a permanent attraction at Wisley.