World Therapeutic Horticulture Day (WTHD) returns on 18 May 2026, inviting people across the globe to celebrate the life‑changing power of gardening for health and wellbeing — and to champion the growing recognition of therapeutic horticulture as a vital, evidence‑based practice. Founded by Trellis in 2023, this annual day has quickly become a vibrant international movement, uniting practitioners, gardeners, organisations, and anyone who has ever felt the benefit of Therapeutic Horticulture.
Whether you’re deeply rooted in the field or just beginning to explore it, you’re warmly welcomed to join in, helping to shine a light on this important profession and broaden access so everyone can benefit.
And getting involved is simple — use the free-to-download WTHD resources, share your stories, activities and garden moments on social media with #WTHD, spread the word in your community, and add your project or country to the global participation map to help grow recognition for therapeutic horticulture worldwide.
Why WTHD matters
Therapeutic horticulture is so much more than gardening. It’s connection, purpose, community, and care — a practice that supports mental, physical, emotional, and social wellbeing. WTHD shines a light on the people who deliver this work, the communities who benefit, and the growing global recognition of the profession. Countries already taking part include the UK, United States, France, Italy, India, Nigeria, Sweden, the Dominican Republic, Croatia — and the list keeps growing.
How to get involved
Taking part is wonderfully simple, scroll down to access them:
- Download free WTHD resources — logos, social posts, info sheets, and more
- Post on social media using #WTHD and Share your story — a moment in nature, a favourite garden space, an activity in action. Remember to tag us!
- Spread the word in your community, workplace, or organisation
- Join the global map by adding your country or project to the participation form
Every post, story, and shared experience helps build momentum and recognition for therapeutic horticulture worldwide.
International Seminars
Join us for some wonderful international seminars. Take a look at our speakers below!
WTHD Seminars 2026
Growing Resilience: TH Program Outcomes Among University Students, Florida - Leah Diehl
Growing Resilience: TH Program Outcomes Among University Students, Florida - Leah Diehl
College students face increasing stress and anxiety, contributing to both personal and academic challenges. This study examined the impact of...
Effect of Horticultural Therapy: Synopsis of Evidence, Hong Kong & Vietnam - Claudia K. Y. Lai
Effect of Horticultural Therapy: Synopsis of Evidence, Hong Kong & Vietnam - Claudia K. Y. Lai
Horticultural therapy (HT) has the merits of being a non-pharmacological intervention and easily accessible in the community, even in densely...
Get involved! Download the resources
Press release
Download the press release.
TH around the World - Carousel
Download and share on your social media. This carousel is available in template format to allow you to edit the post. Click Here for some quick steps on how to access and download the carousel.
What is Therapeutic Horticulture? - Reel
Download and share on your social media. This reel is available in template format to allow you to edit the post. Here are some quick steps on how to access and download the reel.
We are very grateful to our partners at Root in Nature for all their work helping to promote WTHD.
World Map
Emilee Weaver of Root in Nature is creating a globe icon showing each participating country as a flag. The data added will be combined to create a globe icon representing how much participation we have from around the world. We can all share this globe icon in May to show how big the movement is and later to show that more countries are taking part after WTHD week (this will be a good measure of the impact of our collective efforts).
Please complete the details on the form below to show your country will be participating. Thanks for filling in your information!
Watch this short video and hear about the importance of Therapeutic Horticulture.
Did you know that Therapeutic Horticulture is more than just gardening?
Download and share the link to this reel
World Therapeutic Horticulture Day
World Therapeutic Horticulture Day (WTHD), inaugurated by Trellis in 2023, on the 18th May each year is a worldwide celebration that aims to raise awareness of the practice of therapeutic horticulture the many benefits it brings to communities around the world and the amazing people who work in the field.
