Horticultural therapy and therapeutic gardens

Domain XV · Nature, philosophy, social & rites of passage

What it is

Horticultural therapy is not a psychotherapy school but a goal-directed professional modality. AHTA defines horticultural therapy as participation in horticultural activities facilitated by a registered horticultural therapist to achieve specific goals within an established treatment,…

Format

• The AHTA Standards of Practice set out the treatment process as a cycle rather than a fixed number of sessions.
• Phase 1: Referral and assessment. Goal: decide whether horticulture fits the person's needs and collect what you need to plan safely. AHTA Standard 4 requires a confidential assessment covering diagnostic data, physical, social, mental and emotional aptitude, and current horticultural skills;…

Who practises it, and how they are trained or regulated

• Training and credentials. AHTA registers horticultural therapists as HTR (undergraduate degree, specified human-science, horticulture and horticultural therapy coursework, and a 480-hour supervised internship or equivalent experience) and therapeutic horticulture practitioners as THP (therapeutic horticulture coursework and at least 500 hours of work). NC State Extension (updated January 2026) states there is no US…
• Horticultural therapy is not a psychotherapy school but a goal-directed professional modality. AHTA defines horticultural therapy as participation in horticultural activities facilitated by a registered horticultural therapist to achieve specific goals within an established treatment, rehabilitation or vocational plan, and states that the process itself, not the end product, is the therapeutic activity. Therapeutic…
• For the psychotherapist this guide covers four roles: delivering horticultural therapy or therapeutic horticulture where you hold the training (AHTA registration or a UK STH qualification); integrating plant-based tasks into your own therapy; preparing, referring and debriefing a client who attends a programme such as Thrive's; and working with the meaning of gardening, gardens and plant loss in the client's life.…

Evidence status, as the guide reports it

• Evidence status in one line: a meta-analysis of 22 studies found a positive overall effect of gardening on health outcomes with signs of publication bias (Soga, Gaston and Yamaura); a 2022 meta-analysis of 13 studies in older adults found lower depression scores with horticultural therapy but very…

Questions to explore with your client

• What drew you to it, and what are you hoping it will change?
• Is there physical contact? Was it explained beforehand, and do you feel free to say no or stop at any point?
• Does it involve any substance, plant preparation, remedy or supplement? Has your doctor or prescriber been told, especially about any medication you take?
• Does it involve intense or unusual breathing? Have you been told about the medical conditions for which that is not advised?
• Does it involve fasting, a special diet or 'detox'? Have you discussed this with your doctor?
• Who runs it, and what training or registration do they hold?
• What actually happens in a session or meeting, and how often?
• What does it cost, and is there pressure to commit to more?
• How do you feel afterwards, in the hours and days that follow?
• Does it fit with, or clash with, the work we do here?

What practitioners of it watch for

• over-interpreting; turning every task into a metaphor. Working: the client brings up concerns while working.
• a garden designed for show rather than use. Working: clients use the garden outside programmed sessions too.
• exclusion, scapegoating, a client's discomfort at public exposure. Working: unprompted helping between participants.
• sudden grief or loss of a garden or home; hold it rather than redirect it. Working: richer recall and positive affect.
• tasks that are busywork; tasks too long for attention span. Working: the task produces observable behaviour on the objective.

Problems the guide addresses

• Low motivation, non-attendance and withdrawal
• Plant failure, perfectionism and self-criticism
• Overwhelm, sensory overload and distress in the garden
• Physical limits, pain, heat and weather
• Allergies, infection and plant toxicity incidents
• Group conflict, difficult behaviour and ruptures
• Confidentiality, being seen and boundaries outdoors
• Dual roles and competence
• Self-harm risk and tools
• Eating, food and body concerns

When to involve someone else

• New or worsening physical symptoms, or advice to stop or change prescribed medication: involve the client's doctor or prescriber.
• Signs of coercion, isolation from family and friends, escalating costs or secrecy: discuss openly and consider safeguarding.
• A crisis or thoughts of suicide: follow your crisis protocol. In the US, call or text 988; in the UK and Ireland, Samaritans on 116 123.

Drawn automatically from the guide's own sections. Stay curious: neither endorse nor dismiss what the client values, and check anything that matters against the full guide and its sources. Not medical advice.