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.

Getting started with your therapeutic gardening project can be overwhelming, but we’ve got all the resources and information you need to get gardening. From activity sheets to factsheets, how-to videos and books, we’re here to help you and your group benefit.