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CompletedNCT04917666Updated Jun 8, 2021

Process and Outcomes of Horticultural Therapy for People With Disabilities

An interventional study of Horticultural therapy and Comparison in Mental Disorders, Severe and Intellectual Disability, sponsored by The Hong Kong Polytechnic University. Completed at 1 site in Hong Kong. Open to participants aged 18 Years to 65 Years. Per ClinicalTrials.gov, last updated 2021-06-08.

Sponsored by The Hong Kong Polytechnic University · Not applicable, Interventional, and Treatment

From the registry’s dates

  • Registered 1 year 7 months after the study started (first participant enrolled Sep 2019, registered Apr 2021).
Phase
Not applicable
Study type
Interventional
Enrollment
50
Allocation
Randomized
Ages
18 Years to 65 Years
Sex
All
01

Study summary

Horticultural therapy (HT) "is the engagement of a client in horticulture activities facilitated by a trained therapist to achieve specific and documented treatment goals" (American Horticultural Therapy Association, 2012). People's interactions with plants, through goal-orientated horticultural activities in the form of active gardening, as well as the passive appreciation of nature, could be therapeutic to people with mental or intellectual disabilities in many ways (Eling, 2006; Parkinson, Lowe, \& Vecsey, 2011). This study aims to conduct evaluation studies of HT group programmes for care home residents with severe mental illness.

Read the detailed description

This is a randomized, single-blind, controlled study in which the outcomes of the horticultural therapy program is compared with a comparison group. Outcome measures were compared at Pre-intervention and post-intervention.

02

Conditions studied

  • Mental Disorders, Severe
  • Intellectual Disability

Keywords

  • horticultural therapy
  • severe mental illness
  • care home residents
03

In context

Intellectual Disability

363 studies on the registry are indexed under Intellectual Disability; 103 are open to participants now.

This study's enrollment of 50 is close to the median of 53 across 236 interventional studies indexed under Intellectual Disability.

Browse Intellectual Disability studies →

Lead sponsor

The Hong Kong Polytechnic University is the lead sponsor of 659 studies on the registry; 250 are open to participants now.

Counted across the registry records on this site, refreshed daily.

04

Who can participate

Ages eligible
18 Years to 65 Years
Sexes eligible
All
Accepts healthy volunteers
No

Inclusion criteria

  • diagnosis of severe mental disorder, e.g. schizophrenia, schizoaffective disorder, bipolar disorder.
  • age 18 - 65.
  • care home resident

Exclusion criteria

Exclusion Criteria:

  • organic brain disorder
  • difficulties in communication for joining horticultural activity.
05

Study design

Phase
Not applicable
Primary purpose
Treatment
Allocation
Randomized
Intervention model
Parallel assignment
Masking
Single (Outcomes assessor)
Enrollment
50 participants (actual)

Study arms

  • Experimental
    Treatment

    Participants joined a 8-session horticultural therapy group program (60 minutes per session) over 8 weeks.

    Behavioral: Horticultural therapy

  • Other
    Comparison

    Participants joined 4 sessions of individual, parallel, and table-top activities of their own interest, e.g. reading, drawing, coloring.

    Other: Comparison

Interventions

  • BehavioralHorticultural therapy

    A structured 8-session group therapy program, in which participants learn about plants, green spaces, plant-human interactions. During the program, the participants are guided by therapist to grow or take care of both indoor and outdoor plants, do small horticulture projects (like cooking, making drinks, herb projects).

  • OtherComparison

    4 session of semi-structured and free engagement in activities of their choice. The activities that they could choose are mostly table-top activities which are solitary in nature, and does not require social interaction.

06

What researchers measure

Primary outcomes

  1. Change in Mental Well-being

    Chinese Short Warwick-Edinburgh Mental Well-being Scale (C-SWEMWBS). The C-SWEMWBS uses a five-point Likert scale. The average scores for the scale ranges between 1 and 5, and a higher score indicates better mental well-being.

    Time frame: Pre-test, Postest (8 weeks from pre-test), Change from Pretest to Posttest is assessed

  2. Change in Engagement in Meaningful Activity Scale (EMAS)

    Engagement in Meaningful Activity Scale (EMAS). The EMAS has 12 items measured on a four-point Likert scale. The average score for the scale is 1- 4 and a higher score indicates higher engagement.

    Time frame: Pre-test, Postest (8 weeks from pre-test), Change from Pretest to Posttest is assessed

  3. Change in Perceived Benefits of Horticultural Therapy

    This is a opinion survey developed by the clinical setting to collect participants' attitude toward horticultural therapy. It has 7 items and participants are asked to respond using a five-point scale ranging from "strongly disagree" to "strongly agree". The average score ranges from 1 to 5, and a higher score indicates that the participant perceived the benefits of horticulture therapy as higher.

    Time frame: Pre-test, Postest (8 weeks from pre-test), Change from Pretest to Posttest is assessed

07

Study locations

1 site
  • Tung Wah Group of Hospitals Wong Chuk Hang Complex
    Wong Chuk Hang, Hong Kong
08

Updates

Tracking since Sep 25, 2026
No changes since tracking began. The registry record was last updated on Jun 8, 2021, before this site started recording changes on Sep 25, 2026. Its history is on ClinicalTrials.gov ↗
09

Registry details

Key details

Study ID
NCT04917666
Lead sponsor
The Hong Kong Polytechnic University
Responsible party
Sponsor
First posted
Jun 8, 2021
Start date
Sep 1, 2019
Primary completion
Sep 30, 2020
Completion
Jan 29, 2021
Last update
Jun 8, 2021

Study contacts

Andrew MH Siu, PhD
principal investigator · The Hong Kong Polytechnic University

Oversight

Data monitoring committee
No
FDA-regulated drug
No
FDA-regulated device
No
View the source record on ClinicalTrials.gov ↗

Not currently enrolling

This study is completed, as verified in Mar 2021. You cannot join it, but the record below documents what was studied.

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