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The effect of horticultural therapy (HT) on immune and endocrine biomarkers remains largely unknown. We designed a waitlist-control randomized controlled trial to investigate the effectiveness of HT in improving mental well-being and modulating biomarker levels. A total of 59 older adults was recruited, with 29 randomly assigned to the HT intervention and 30 to the waitlist control group. The participants attended weekly intervention sessions for the first 3 months and monthly sessions for the subsequent 3 months. Biological and psychosocial data were collected. Biomarkers included IL-1β, IL-6, sgp-130, CXCL12/SDF-1α, CCL-5/RANTES, BDNF (brain-derived neurotrophic factor), hs-CRP, cortisol and DHEA (dehydroepiandrosterone). Psychosocial measures examined cognitive functions, depression, anxiety, psychological well-being, social connectedness and satisfaction with life. A significant reduction in plasma IL-6 level (p = 0.02) was observed in the HT intervention group. For the waitlist control group, significant reductions in plasma CXCL12 (SDF-1α) (p = 0.003), CXCL5 (RANTES) (p = 0.05) and BDNF (p = 0.003) were observed. A significant improvement in social connectedness was also observed in the HT group (p = 0.01). Conclusion: HT, in reducing plasma IL-6, may prevent inflammatory disorders and through maintaining plasma CXCL12 (SDF-1α), may maintain hematopoietic support to the brain. HT may be applied in communal gardening to enhance the well-being of older adults.

Psychiatric inpatients often endure anxiety. This randomized trial assessed the impact of horticultural therapy on anxiety in adult psychiatric inpatients over four weeks, compared to standard care. Recruiting 211 inpatients from six units were randomized into control (n = 105) and experimental (n = 106) groups. Control received usual care; the experimental group had horticultural therapy alongside usual care. Anxiety, measured using HADS-A scale at four weeks, aimed to establish horticultural therapy's superiority. After four weeks, horticultural therapy significantly reduced anxiety compared to standard care ( P  < 0.001). These results argue in favor of integrating horticultural therapy into psychiatric nursing practices. Trial registration : No Clinical Trail: NCT02666339 (1st registration: 28/01/2016).

Institutionalized older adults have limited ability to engage in horticultural activities that can improve their physical and mental health. This study explored the effects of a combination of 3D virtual reality and horticultural therapy on institutionalized older adults' physical and mental health. The study used a quasi-experimental design. A total of 106 older adults from 2 long-term care facilities were recruited and assigned to the experimental (n=59) or control (n=47) group. The experimental participants received a 9-week intervention. Both groups completed 3 assessments: at baseline, after the intervention, and 2 months later. The outcome variables included health status, meaning in life, perceived mattering, loneliness, and depression. The experimental group demonstrated significantly improved health status (P<.001), meaning in life (P<.001), and perceived mattering (P<.001) as well as significantly reduced depression (P<.001) and loneliness (P<.001) compared to the control group immediately after the intervention; these effects persisted for up to 2 months. This study verified the beneficial effects of a combination of 3D virtual reality and hands-on horticultural therapy on older adults' health. These results could support the future successful implementation of similar programs for institutionalized older adults on a larger scale.

Background Dementia is a progressive disease, and as the disease progresses, many families seek help through activities and therapies. In contrast to some other therapies, horticultural therapy (HT) is widely accepted by most people with dementia (PWD) because it invites them to the natural world. Objectives To explore whether HT emotional and communication measures (i.e. appropriate expression of emotions, ability to communicate with others) are higher than in other activities offered to PWD in adult day care centers (ADCC) and continuing care retirement community (CCRC), and whether there is a difference between the impact of HT on the number of “positive actions” (communication actions and actions that fit the guided activity) vs. the other activities. Research design and methods Fifty-one PWD attending ADCCs and living in one CCRC were recruited to a structured HT activity and other activities that took place in the ADCCs and CCRC. The activity took place over 10 weeks. The effects were assessed using Dementia Care Mapping (DCM) and questionnaires. Results Paired t-tests found that higher levels of mood and behavior were observed during HT activities compared to the other activities. Also, communication and function actions were higher in the HT activities as compared to the other activities. Discussion and implications This study adds to the growing evidence of the benefits of HT for PWD regardless of past experience in gardening/agriculture. HT seems to provide high therapeutic benefits and should be more prevalent in centers caring for PWD.

This study evaluated the efficacy of horticultural therapy (HT) in improving affective symptoms and functional outcomes in individuals with depressive disorders. A systematic search was conducted across the PubMed, EMBASE, Cochrane Library, CINAHL, CEPS, CNKI, and Wanfang databases. Randomized controlled trials (RCTs) implementing HT were included. Outcomes assessed included differences between HT and control groups in depression, anxiety, physical function, cognitive function, social function, and quality of life. A random-effects model was used to calculate Hedges’ g. Risk of bias was assessed using the Cochrane Risk of Bias tool, and the certainty of evidence was evaluated using the GRADE approach. Thirteen RCTs (n = 960) were included. HT significantly improved depression (g = 1.050; 95 % CI: 0.663–1.437), anxiety (g = 0.702; 95 % CI: 0.341–1.062), cognition (g = 0.816; 95 % CI: 0.302–1.331), social function (g = 0.806; 95 % CI: 0.295–1.317), and quality of life (g = 0.947; 95 % CI: 0.633–1.260). Only one study reported improvement in physical function. Subgroup analyses revealed greater effects among inpatients with more severe baseline symptoms who received combined indoor-outdoor HT in care-providing settings for more than eight weeks. However, the certainty of evidence across outcomes ranged from very low to low due to risks of bias, inconsistency, and imprecision. This review provides preliminary support for the efficacy of HT in depressive disorders. Given methodological limitations and potential biases, further well-designed trials with registration, blinded assessors, and long-term follow-up are warranted. •HT significantly improved depression, anxiety, cognition, social function, and quality of life in depressive disorders.•Strongest effects seen in inpatients receiving indoor-outdoor HT in care settings for over eight weeks.•Findings support HT as a feasible adjunct or alternative to depression treatments; further trials are needed.

Harvest for Health is a home-based vegetable gardening intervention that pairs cancer survivors with Master Gardeners from the Cooperative Extension System. Initially developed and tested in Alabama, the program was adapted for the different climate, growing conditions, and population in New Mexico. This paper chronicles the feasibility, acceptability, and preliminary efficacy of “Southwest Harvest for Health”. During the nine-month single-arm trial, 30 cancer survivor-Master Gardener dyads worked together to establish and maintain three seasonal gardens. Primary outcomes were accrual, retention, and satisfaction. Secondary outcomes were vegetable and fruit (V and F) intake, physical activity, and quality of life. Recruitment was diverse and robust, with 30 survivors of various cancers, aged 50–83, roughly one-third minority, and two-thirds females enrolled in just 60 days. Despite challenges due to the COVID-19 pandemic, retention to the nine-month study was 100%, 93% reported “good-to-excellent” satisfaction, and 87% “would do it again.” A median increase of 1.2 servings of V and F/day was documented. The adapted home-based vegetable gardening program was feasible, well-received, and resulted in increased V and F consumption among adult cancer survivors. Future studies are needed to evaluate the effectiveness of this program and to inform strategies to increase the successful implementation and further dissemination of this intervention.

Converging evidence indicates that Horticultural Therapy (HT) contributes to significant reductions in stress, loneliness, and depression, notable risk factors for suicidality. This pilot study aimed to assess the initial feasibility and acceptability of HT when virtually administered. Telehealth-delivered horticultural therapy (TeleHT) was administered to groups of Veterans, including those with elevated suicide risk over the course of four weeks. Participants were each sent a package through the mail of at-home gardening supplies that were used to facilitate multisensory, nature experiences during weekly HT sessions administered via Zoom. Participants completed thermometer-based scales for the suicide risk factors of stress, loneliness, depression, and pain before and after each TeleHT session. Post-intervention qualitative assessments were completed upon the conclusion of the four-week intervention. Significant reductions in stress, depression, and loneliness risk were observed from weekly pre- to post-session measures (p < 0.05), with 89.1 % HT completion rate. Stress, pain, depression, and loneliness indices also showed small to medium sized symptom reduction amongst Veterans with no history of suicidality (Cohen’s d=−0.70, d=−0.49, d=−0.62, d=−0.71), while those with elevated suicide risk at baseline also showed reduction in these risk factors with small to medium effect sizes (d=−0.58, d=−.018, d=−0.46, d=−0.41). Qualitative post-intervention assessments indicated a high degree of acceptability and pointed to the inclusion of mailed gardening packages as particularly relevant to positive experiences. While future work is needed to fully assess efficacy, findings from this pilot study demonstrate an initial feasibility and acceptability through a high retention rate and positive qualitative assessments for TeleHT that mirror that of the in-person intervention. •TeleHT results in significant reduction in stress, depression, and loneliness.•High rate of retention of 89.1 % indicates initial acceptability.•Qualitative post-assessments indicate high feasibility and acceptability.•TeleHT Qualitative and quantitative results are in line in-person HT intervention.

Abstract Globally, prisoners tend to come from marginalized and socially disadvantaged sections of the society and exhibit a high incidence of ill health, linked to social exclusion and multiple complex needs. Prisons therefore offer an important opportunity to tackle inequality and injustice, through promoting health, reducing reoffending and facilitating community reintegration.This paper reports on and critically discusses findings from an evaluative research study, which aimed to identify and explore impacts of prisoners’ participation in an innovative social and therapeutic horticultural programme, ‘Greener on the Outside for Prisons’ (GOOP), delivered in prisons in North West England. Focus groups with 16 prisoners and semi-structured interviews with six prison staff were conducted at five sites. Presented under three overarching themes (health and well-being; skills development, employability, and work preparedness; and relationships), findings suggest that engagement with and participation in GOOP were important in improving positive mental well-being, increasing physical activity and knowledge about healthier eating; developing skills and work readiness; and building relationships and catalysing and strengthening prosocial behaviours, important for good citizenship and effective resettlement. The paper concludes that – in the context of the current UK prison reform agenda and concern about the high incidence of violence, substance misuse, self-harm and suicide – prison-based horticulture can offer multiple benefits and make a significant contribution to the creation of safe, secure, supportive and health-enhancing environments. Furthermore, it contends that by joining up health and justice agendas, programmes such as GOOP have the potential to serve as powerful catalysts for wider systemic change, thereby helping tackle inequalities and social exclusion within societies across the globe.

Horticultural therapy (HT) is a subgroup of occupational therapy (OT). Both HT and OT have been successful as adjunctive treatment modalities in substance abuse treatment. Studies have indicated that gardening promotes neuroendocrine and affective restoration from stress. The study intended to assess the effect of HT versus nonhorticultural OT on cortisol levels, depression, symptoms of posttraumatic stress disorder (PTSD), alcohol cravings, and quality of life. The research team designed a randomized pilot study. The study was open for participation from July 2012-October 2012. It took place during multiple occurrences of a 28-d treatment programs for substance use disorder at a Veterans Affairs medical center. Participants • Participants were 49 veterans, averaging 46.4 y old (SD = 11.9); the dropout rate was 37%. Participants were randomly assigned to the HT or the OT group. They attended supervised HT and OT groups 5 h/d for 3 wk. Outcome Measures • Pre- and posttreatment, participants completed the Quality of Life Enjoyment and Satisfaction Questionnaire-Short Form (Q-LES-Q-SF), the Alcohol Craving Questionnaire (ACQ-NOW), the Posttraumatic Stress Disorder Checklist Civilian Version (PCLC), and the Center for Epidemiologic Studies Depression Scale (CES-D). Salivary cortisol samples were taken at wk 1, 2, and 3. A repeated measures analysis of variance (ANOVA) (F2,20 = 0.878) revealed that the HT performed was associated with a 12% reduction in salivary cortisol levels from wk 1 to wk 3, but the difference was not statistically significant (P = .43). Separate 1-way analyses of covariance (ANCOVAs) revealed no statistically significant differences in the self-administered tests, although both the Q-LES-Q-SF and CES-D showed a trend toward improving quality of life and depressive symptoms in the HT group compared with the OT group. Additional analysis of the nonbiologic tests suggests that most participants in the HT and OT had some benefit from the programmed activities. The trends suggest that HT may modulate stress in veterans, as evidenced by decreased cortisol levels and depressive symptoms, and may improve quality of life more than the programs in which the OT group participated. Further investigation with larger samples, including a nontreatment control group, is needed to determine whether the observed trends are treatment effects or due to abstinence.

Background Depressive symptoms and memory problems are significant risk factors for dementia. Exercise can reduce depressive symptoms and improve cognitive function in older people. In addition, the benefits of horticultural activity on physical and mental well-being have been demonstrated in people with dementia. Although evidence of such non-pharmacological interventions is mounting, no studies have examined whether physical exercise and horticultural activity exert a positive impact on brain and mental health (e.g., depressive symptoms) in non-demented older adults at high risk of cognitive impairment and depression. Therefore, we propose a randomized controlled trial to assess the efficacy and efficiency of physical exercise and horticultural activity in improving brain and mental health in community-dwelling older adults with memory problems and depressive symptoms. Methods/Design The 20-week randomized controlled trial will include 90 community-dwelling adults aged 65 years or older with memory problems and depressive symptoms. Participants will be randomized to one of three experiments: exercise, horticultural activity, or educational control group, using a 1:1:1 allocation ratio. The combined exercise program and horticultural activity program will consist of 20 weekly 90-minute sessions. Participants in the exercise group will practice aerobic exercise, muscle strength training, postural balance retraining, and dual-task training. The horticultural activity program will include crop-related activities, such as field cultivation, growing, and harvesting. Participants in the educational control group will attend two 90-minute educational classes during the 6-month trial period. Depressive symptoms and memory performance will be measured by the Geriatric Depression Scale-15, and the Logical Memory subtests of the Wechsler Memory Scale-Revised will be used to measure depressive symptoms and memory performance as primary outcomes, at baseline (prior to randomization), immediately following intervention (6 months from baseline), and 6 months after intervention. Hippocampal volume will be measured at baseline and immediately after intervention, using magnetic resonance imaging. Secondary outcomes will comprise cognitive function, including language, attention/executive performance, and processing speed; brain-derived neurotrophic-factor serum levels; and health-related quality of life. Discussion This intervention study will determine the clinical importance and efficacy of physical exercise and horticultural activity as non-pharmacological interventions in community-dwelling older adults at high risk of poor brain and mental health. Trial registration UMIN000018547 ; registered 7 August 2015.