If you have spent time in a treatment setting, you may have come across a garden – raised beds, a greenhouse, a plot of ground that people work on as part of their week. It can look like a pleasant extra. It is actually a recognised therapeutic practice with a name, a professional body, and a research literature: horticulture therapy.
It is also a practice that gets oversold. So here is what it is, what the evidence supports, and – just as usefully – what the evidence does not yet show.
What is horticulture therapy?
Horticulture therapy (also written horticultural therapy) is the structured use of plants and gardening activity to work towards defined clinical or personal goals. The defining word is structured. A therapeutic garden session is planned, facilitated, and aimed at something specific – reducing anxiety, rebuilding routine, practising sustained attention, working alongside other people – and its progress is observed the way any other therapeutic activity would be.
That is what separates it from gardening as a hobby, which can be restorative but is not therapy. The difference is not the plants; it is the intent, the facilitation, and the goal.
Related terms describe overlapping practices: garden therapy, therapeutic gardening, and the broader family of nature-based and experiential therapies that also includes wilderness and adventure programming.
What the evidence actually shows
This is where honesty matters more than enthusiasm.
Horticultural therapy has been studied, and results are encouraging. A systematic review of randomised controlled trials concluded that it “may be an effective treatment for mental and behavioral disorders such as dementia, schizophrenia, depression, and terminal-care for cancer.”
The same review is candid about the limits. It found “insufficient evidence in the studies of HT due to poor methodological and reporting quality and heterogeneity,” and stated plainly that the trials conducted have been “of relatively low quality” – with common omissions around randomisation, blinding, and analysis. Only four trials met its inclusion criteria.
Where the evidence is strongest, it is also narrow. A meta-analysis of horticultural therapy for depression found a substantial effect, but it examined 13 studies of 698 adults aged 60 and over with mild to moderate depression, explicitly excluding major depression. That is a meaningful result for that population. It is not a finding that automatically transfers to a thirty-year-old in residential addiction treatment.
And the most important gap: horticultural therapy has not been formally studied as a treatment for substance use disorder. Addiction was not among the populations in the review above. Any source telling you that gardening treats addiction is going beyond what the research currently supports.
That does not make it worthless – it makes it a supportive practice rather than a primary one, which is exactly how a good treatment programme would use it.
How it’s used in addiction treatment
In practice, horticulture therapy is generally one component of an experiential or adjunctive track, sitting alongside the therapies that do the primary clinical work – individual therapy, group work, medical care, and treatment for any co-occurring mental health condition.
The reasons programmes use it are plausible and mostly about the shape of the activity rather than the plants themselves:
- It rebuilds routine. Plants require attention on their schedule, not yours. Early recovery often involves reconstructing a daily structure that substance use dismantled.
- It tolerates being bad at it. There is no performance and no audience. For people whose self-image has taken years of damage, an activity with a low floor and visible progress is unusual and useful.
- It is shared work rather than shared talking. Some people open up more easily side-by-side than face-to-face, which is part of why experiential therapies exist at all.
- The feedback loop is slow and real. Something grows, or it doesn’t, over weeks. That is a different experience of cause and effect from the one substances provide.
These are mechanisms, not proven outcomes for addiction. Stated as mechanisms, they are honest.
What a session actually looks like
Less picturesque than it sounds, and that is the point. Sessions are usually small-group, run on a schedule, and organised around real tasks: preparing beds, propagating and potting, watering and pruning, harvesting, and clearing up.
Facilitation is what makes it therapeutic. A practitioner sets the task, works alongside the group, and uses what comes up – frustration when something dies, impatience with a slow process, satisfaction at a result earned over weeks – as material worth talking about.
Research on depression in older adults found that participatory activity outperformed observation, and that courses of roughly four to eight weeks appeared more effective than longer ones. Doing the work matters more than being in the space.
Who it helps most
Horticulture therapy tends to suit people who:
- find talking therapy easier when their hands are busy
- have lost daily structure and are rebuilding it
- respond to visible, incremental progress
- want time outdoors without the demand of a physical challenge
- like caring for something without the weight of another person depending on them
It is not for everyone, and it should not be sold as though it were. Some people find it tedious, and that is a legitimate response rather than a failure of engagement. It also carries practical considerations – allergies, physical limitations, seasonality, and in a climate like Colorado’s, a growing season that shapes what is possible when.
If someone is in acute withdrawal or medical crisis, this is not the intervention that matters. Medical care is.
Horticulture therapy and experiential treatment
Choice House’s approach includes experiential and nature-based therapies that get clients outdoors and working with their hands, rather than relying on talk therapy alone. Programmes vary in exactly which experiential elements they offer, so if a horticultural or gardening component appeals to you, it’s worth asking any provider how experiential therapy fits into their programme and what a typical week involves. (Our overview of experiential therapies and their benefits is a good place to start, and nature-based treatment works on many of the same principles.)
If you’re struggling with addiction, you don’t have to work through it alone. Choice House offers inpatient residential treatment and transitional sober living for men in Boulder, Colorado, with care for co-occurring mental health conditions alongside substance use. Call 720-577-4422 or reach out through our website to talk it through and find out what options might help.