On Monday, the Princess of Wales launched a new video revealing how she embraced "the healing power of nature" during her cancer treatment.
The new project, whose videos will be released on Kensington Palace's social media channels, began today with a three-minute film entitled "Spring." It was narrated by the Princess and included footage of her and Prince William on the Isle of Mull earlier this month.
The other three short films will be released across the course of the year, with Summer, Autumn and Winter editions in due course.
Middleton said: 'Over the past year, nature has been my sanctuary.
'The natural world's capacity to inspire us, to nurture us and help us heal and grow is boundless and has been understood for generations.
"It is through nature, that we can fully understand the true interconnectedness of all things, the importance of balance and the importance of renewal and resilience. Connecting to nature helps us to experience a deeper sense of ourselves, the world around us, and each other.''
She added: ''Spring is a season of rebirth, of hope and new beginnings. From the dark days of winter, the outside world quietly awakens with new life, and there comes a sense of optimism, anticipation, and positive, hopeful change.
''Just as nature revives and renews so too can we. Let us reconnect to nature and celebrate a new dawn within our hearts.
''It is often from the smallest of seeds that the greatest change can happen, and in this ever-growing complex world, we need to hold on to what connects us all.
''Spring is here, so let's make the most of it together.''
The princess also referred to Mental Health Awareness Week.
The post published by Kensington Palace pages said: "This year's Mental Health Awareness Week, we are celebrating humanity's longstanding connection to nature, and its capacity to inspire us and help us to heal and grow in mind, body and spirit.
''As we confront the challenges of an increasingly complex and digital world, the importance of the connection between humanity and nature takes on even more significance.
''The Mother Nature series is a reminder and reflection of the beauty and complexity of the human experience. It is a tribute to the lessons we can learn from nature, helping us to foster our own growth, strengthen our bonds with the world around us and each other.''
''Mother Nature' is described as a 'celebration of the raw, untamed beauty of the changing seasons across the UK''.