Trellis founded the Association for Social and Therapeutic Horticulture (ASTH) and the new Professional Development Award (PDA) in Social and Therapeutic Horticulture. Trellis are here helping you build recognised skills, deepen your knowledge and contribute to a shared national standard for quality practice. Whether you’re preparing for formal assessment or strengthening your day‑to‑day delivery, our learning resources, forums and peer networks offer a supportive pathway to grow your confidence and shape the future of STH across Scotland.
Professional Body
Welcome to the UK Association for Social and Therapeutic Horticulture (ASTH) – the professional body representing therapeutic horticulture across the UK.
Professional Development Award
We are currently developing a Professional Development Award that we hope will be available in 2026, and is likely to be based on a day release model.
Research Library
Gardens and gardening do great things for our health and wellbeing, and the evidence of these effects is now significant.
Recommended Reading
We are often asked for recommended reading on various aspects of therapeutic gardening. This page share some reading suggestions from our network with their recommendations.