Criminal Behaviour and Mental Health(2015)
Published online in Wiley Online Library(wileyonlinelibrary.com) DOI: 10.1002/cbm.1978

Editorial
Green prison programmes, recidivism
and mental health: A primer

SANDER VAN DER LINDEN1,2, 1Department of Psychology, Princeton
University, Princeton, NJ, USA; 2Woodrow Wilson School of Public Affairs,Princeton University, Princeton, NJ, USA

Although the USA has the largest prison population in the world, most prison
rehabilitation programmes have been criticised for lacking any demonstrable
efﬁcacy, ultimately ‘having no appreciable effect on recidivism’ (Lipton et al.,1975, p. 25). Yet, since the 1990s, prisons around the USA have witnessed thegrowth of so-called green prison programmes. Prominent examples of such initiatives include the Insight Garden Program (IGP) administered in the SanQuentin, California (CA) State Prison, The Garden Project in San Francisco,CA, the Sustainability in Prisons initiative administered throughout Washington
State prisons, the Sandusky County Jail Gardening program in Ohio and perhaps
most notably, the ‘GreenHouse’ (GH) program in Riker’s Island, New York City.
While variations exist, ‘green’ prison programmes essentially provide a form ofeco-therapy to prisoners – which is prescribed physical and psychological therapy
through nature-based methods administered by trained professionals. Participation in these programmes usually involves engaging in gardening and horticultural activities such as landscaping, cultivating plants, green roof gardening andlearning about environmental stewardship and caring for nature and animals.
Many of these programmes also provide basic vocational education, practice
mindfulness and teach prisoners social skills, such as how to work effectively withothers (Jiler, 2006). These programmes should be a focal point of interest to bothresearch and public policy for two outcomes: (1) low recidivism rates and (2) improved mental health. Self-published recidivism rates of graduates of green prison
programmes are exceptionally low, ranging between 10% and 24% depending on
the speciﬁc programme (Gilbert, 2012). Unfortunately, the data underlying thesenumbers are often not made public. They come mainly from internal programmeevaluations based on small and self-selected samples that often have no clearly

Copyright © 2015 John Wiley & Sons, Ltd.

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DOI: 10.1002/cbm

van der Linden

deﬁned or matched reference group. Moreover, no systematic long-term evaluations of such programmes have been conducted, partly because obtaining criminal
record data for prisoners after their release from such programmes is often challenging. Nonetheless, limited post-conviction release data for one of the largest‘green prison’ programmes in the country, the Riker’s GreenHouse/GreenTeam
programs (https://thehort.org/horttherapy_greenhouse.html), were made availableby Laichter (2008). New York state identiﬁcation numbers were collected by theGreenHouse staff and submitted to the New York State Division of Criminal Justice
Statistics, who tabulated and aggregated unsealed convictions post-release fromRikers for 568 formerly incarcerated GreenHouse and GreenTeam program participants released between 1999 and 2007. In order to gauge the efﬁcacy of these
programmes, I compared their 1- and 3-year reconviction rates to those for (1)New York state as a whole over the closest matching period for which data are available (2001–2008), (2) the latest national/federal statistics (2005) and (c) Riker’s
long-term average reconviction rate for the general inmate population (Figure 1).
It is clear that the 1- and 3-year recidivism rates of prisoners released from Riker’s
Green program are signiﬁcantly lower than those for all prisoners released in thestate of New York during the matched period (1 year – 8.92%, Z = 5.03, p < 0.01;
3 years – 10.17%, Z = 4.89, p < 0.01, proportion tests). It is of note that therecidivism rates for New York state prisoners are almost identical to the nationalnumbers, which have changed little since 1983 (BJS, 2015). Similar differences
are observed for smaller green prison programmes, such as the IGP in San

Reconviction rate after 1 year
Reconviction rate after 3 years

70.00%

65%

60.00%

50.00%
45.20%
42.00%

40.00%
31.83%

30.00%
23.00%

23.00%

20.00%
14.08%

10.00%

0.00%
Riker's Green Prison Program(N = 568)

New York State(N = 59,817)

General US Prison Population Riker's Inmate Population(N = 404,638)(N = 14,000)

Figure 1: Recidivism rates of Riker’s Green program compared with state, national and prison
averageCopyright © 2015 John Wiley & Sons, Ltd.

(2015)
DOI: 10.1002/cbm

Green prison programs: a primer

Quentin, CA. Out of the 117 IGP prisoners who were paroled between 2004 and2010, only 10% returned to prison within 3 years (Benham, 2014). This is significantly lower than California’s average recidivism rate (64%) over the same
period (CDCR, 2014; Z = 12.16, p < 0.01).
The success rate of green prison programmes is not entirely unexpected. Prison
environments are often bleak, chaotic, overcrowded and isolating, with little
access to nature. Garden programmes offer an opportunity for relaxation and relief
from such harsh social environments (Lindemuth, 2007). Environmental psychology – or the study of how people interact with their sociophysical environment (Gifford, 2014) – can offer valuable insights into the success of theseprogrammes. A recent meta-analysis of over 240 studies, for example, provides
support for the physical and mental health beneﬁts of nature-assisted therapy ina variety of clinical settings, from treating physical pain to mental illness(Annerstedt and Währborg, 2011). Long-standing research in environmental
psychology and cognitive neuroscience has shown that nature is restorative; evenbrief exposure to the natural environment can promote physical and mental
health, including improved cognitive functioning (Kaplan and Kaplan, 1983;
Ulrich, 1984), psychological well-being and lower stress and blood pressure(Ulrich et al., 1991; Selhub and Logan, 2012; MacKerron and Mourato, 2013;
White et al., 2013; Bratman et al., 2015). Exposure to nature may also promote
cooperative behaviour and pro-social values (Zelenski et al., 2015).
Some of these ﬁndings have been replicated in prison populations. Moore(1981), for example, found that cells with window views of grass and trees are
generally associated with fewer prisoner sick calls. Results from qualitative interviews with (former) green prison programme participants can help to illuminate
some of the mechanisms that contribute to the success of these initiatives. For
example, garden programmes often promote feelings of purpose, self-efﬁcacy
and self-worth among prisoners who then feel less depressed, less aggressive andmore relaxed (Waitkus, 2004; Laichter, 2008; Benham, 2014). The clinical relevance of green prison programmes has also been compared with other ‘newgeneration’ rehabilitation initiatives. For instance, a randomised trial with 48
San Francisco inmates showed that nature therapy was signiﬁcantly better for
improving psychosocial functioning, reducing risk taking and lowering substanceabuse and depression (Rice and Lremy, 1998; Richards and Kafami, 1999). Yet,the long-term efﬁcacy of ‘green’ prison programmes has not been systematicallyevaluated. Moreover, existing studies tend to be based on relatively small samples, often lack untreated or ‘treatment as usual’ controls or comparison groups
of prisoners who participate in other (or multiple) rehabilitation initiatives.
Nevertheless, these results are promising and should capture the attention ofscholars so that larger scale, long-term systematic research can be instituted,
which, in turn, could help practitioners press public policy makers for this potentially cost-effective method of reducing long-term recidivism and improving themental health of society’s prison population.

Copyright © 2015 John Wiley & Sons, Ltd.

(2015)
DOI: 10.1002/cbm

van der Linden

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Green prison programs: a primer

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Address correspondence to: Sander van der Linden, Department of Psychology,Princeton University, Peretsman-Scully Hall 421, Princeton, NJ 08544, USA. Email:sander.vanderlinden@princeton.edu

Copyright © 2015 John Wiley & Sons, Ltd.

(2015)
DOI: 10.1002/cbm