The Duke and Duchess of Sussex visited a preschool for vulnerable kids where they planted flowers in memory of Princess Diana 23 years after her death.

Prince Harry and Meghan Markle made the surprise appearance at the Assistance League of Los Angeles Preschool Learning to plant "forget-me-nots" with pupils.

The couple were snapped wearing face masks and helping children plant flowers on the 23rd anniversary of Princess Diana’s tragic death in Paris, France.

Harry and Meghan helped the youngsters sow forget-me-nots – one of Diana's favourite flowers.

The Duke was just 12, with brother William only 15, when their mum was killed in a car crash on August 31, 1997.

The couple planted flowers with pupils

The Sussexes and the young gardeners planted a mix of flowers and vegetables, including petunias, California wildflowers, tomatoes, squash and sweet peas.

A mix of herbs were already growing in the open space.

Images of the activity were posted on the official Instagram account of the Assistance League of Los Angeles, which helps impoverished children through philanthropy, dedicated service and compassionate programmes.

Harry, Meghan and the children were wearing face masks as they crouched down to dig holes in the soil for the new plants and seeds.

The pre-school learning centre provides childcare to youngsters aged three to five from low-income families.

Harry planted forget-me-nots on the anniversary of Diana's death

Taking to Instagram, the Assistance League of Los Angeles wrote alongside the sweet snaps: "The children of our Preschool Learning Center got a wonderful surprise when The Duke and Duchess of Sussex visited yesterday!

"In addition to helping the children replant the Preschool Learning Center's garden, they spent time with them, sharing their appreciation for nature and helping to instil the importance of healthy eating. We truly appreciate their time and care for our students.

"For more than 100 years, @assistanceleagueoflosangeles has been providing early education services to children in need. Our nationally-accredited preschool instructs 40 students from low-income LA families."

It's 23 years since Princess Diana tragically died

In the past the Duke and Duchess have volunteered at the centre which is a few streets away from where Meghan went to middle and high school.

As they worked they listened to children's nursery music and some of the youngsters danced and sang.

The couple helped school kids plant flowers

The couple also spent some time reading to the students from books featuring gardening, vegetables and planting, including the fairytale Jack And The Beanstalk, which had everyone laughing about magic beans.

Harry and Meghan, who moved to America with son Archie for personal and financial freedom just before the lockdown, have recently bought a £11 million house in the celebrity hotspot of Santa Barbara.

And over the weekend, Harry told of how committed he is to helping causes close to his and Meghan's hearts.

He said the couple “want to make the world a better place.”

In a video-chat with the Rugby Football League he said: "Our little man is our number one priority, but our work after that is the second priority.

“And we’re just trying to do everything we can to do our part to make the world a better place.”