Frontiers in MedicinePublished August 5, 2026DOI ↗Editorial oversight: Dr. Sofia Müller, MD · Lifespan & Whole-Person Care
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Key Takeaway
Consider horticultural therapy as an effective adjunct for geriatric depression, with a potential dose window of 700-800 minutes.
This meta-analysis pooled data from 7 studies with 435 participants to evaluate the effect of horticultural therapy (HT) on geriatric depression. The primary outcome was geriatric depression scores, measured using scales such as the GDS-30 and GDS-15. The analysis demonstrated a significant reduction in depression scores with HT (SMD = -0.52, 95% CI: -0.86 to -0.18, p = 0.0078).
A secondary analysis using a restricted cubic spline (RCS) model suggested a non-linear dose-response relationship, with a potential peak benefit at a cumulative dose of 700-800 minutes of HT. However, this finding was not statistically significant (p = 0.076) and should be interpreted with caution due to the limited number of studies available for dose-response modeling.
Sensitivity analyses comparing the GDS-30 and GDS-15 scales showed a marginally significant trend (p = 0.055) toward higher sensitivity to treatment effects for the GDS-30. This suggests that the choice of depression scale may influence the detection of treatment effects in future studies.
The authors acknowledge limitations including moderate heterogeneity (I2 = 65.6%) and the limited number of studies for dose-response modeling. Adverse events and tolerability were not reported.
In practice, HT appears to be an effective intervention for geriatric depression, with a cumulative dose of 700-800 minutes as a potential exploratory therapeutic window. However, the dose-response finding is hypothesis-generating and requires further validation.
How this fits prior evidence
This meta-analysis extends prior coverage on depression interventions by focusing on a non-pharmacologic, nature-based approach in older adults. It complements findings on MBCT plus escitalopram for older adults with treatment-resistant depression, suggesting that horticultural therapy may offer an additional option. It also aligns with the broader trend toward multidisciplinary management of depression, as seen in the ulcerative colitis and depression research. The significant reduction in depression scores (SMD = -0.52) provides quantitative support for HT, though the exploratory dose-response finding (700-800 min) should be interpreted cautiously.
Living with depression as an older adult can feel isolating and heavy. New research looks at how horticultural therapy—which involves working with plants and gardens—can change that experience. The study looked at 435 seniors across seven different trials to see if getting their hands in the dirt actually helped their mood.
The results showed a significant drop in depression scores for those who participated in gardening programs. While the data is still early, researchers noticed a pattern: the benefits seemed to peak when participants spent between 700 and 800 minutes on these activities. This suggests that consistent engagement with nature provides a meaningful boost to mental health.
Because this research combined several different studies, there was some variation in how people responded. The specific timing for the best results is still being explored by experts. However, the overall finding remains clear: gardening serves as an effective way to support and improve the lives of older adults facing depression.
What this means for you:
Gardening therapy significantly reduces depression scores in seniors, especially with a steady amount of time spent.
Common questions
How does gardening help with depression in seniors?
The study found that horticultural therapy, or working with plants and gardens, led to a significant reduction in depression scores for older adults. This suggests that engaging with nature is an effective way to support mental health in the elderly.
How much time should someone spend gardening to see results?
Researchers found a non-linear relationship between time and benefit. They suggest a potential window of 700 to 800 minutes of activity might offer the most benefit, though this specific finding is still being explored by experts.
Is gardening therapy safe for older adults?
The study did not report any adverse events or safety concerns during the trials. It showed that horticultural therapy was an effective intervention for geriatric depression, but you should always talk to a doctor before starting new treatments.
BackgroundHorticultural therapy (HT) is a promising non-pharmacological intervention for geriatric depression. However, the optimal “dose” required for maximum clinical efficacy remains poorly defined.ObjectiveTo evaluate the efficacy of HT in alleviating geriatric depression and to quantify the dose–response relationship between intervention intensity and clinical outcomes.MethodsA systematic search was conducted across eight databases (including PubMed, Embase, and Cochrane Library, etc) for randomized controlled trials (RCTs) published up to 24 February 2026. Standardized mean differences (SMD) were pooled using a random-effects model. The dose–response relationship was modeled using restricted cubic splines (RCS).ResultsA total of eight RCTs involving 585 participants were initially identified. Systematic sensitivity analysis identified one study as a significant statistical outlier. After its exclusion, the final meta-analysis included seven studies with 435 participants. HT was associated with a significant reduction in geriatric depression scores (SMD = −0.52; 95% CI: −0.86 to −0.18; p = 0.0078). Heterogeneity remained moderate (I2 = 65.6%). The RCS model revealed an exploratory, hypothesis-generating non-linear dose–response relationship (p = 0.076), suggesting that the antidepressant benefit might peak at a cumulative dose of approximately 700–800 min. However, this finding should be interpreted with caution due to the limited number of studies. Subgroup analysis indicated that the GDS-30 scale showed a marginally significant trend toward higher sensitivity to treatment effects than the GDS-15 (p = 0.055). No significant publication bias was detected via Egger’s test (p = 0.936) and Begg’s test (p = 0.652).ConclusionHT is an effective intervention for geriatric depression. A cumulative dose of 700–800 min represents a potential exploratory therapeutic window for maximizing efficacy while minimizing potential fatigue in frail older adults.Systematic review registrationPROSPERO, CRD420261323722.
