A 15 percent increase in productivity across your office workforce would be a significant result by any measure. If your average employee costs $80,000 a year in total compensation, a 15 percent productivity gain is worth roughly $12,000 per employee annually. Across a 25-person office, that is $300,000 in output recovered per year.
The University of Exeter study that produced this figure did not involve a new management system, a compensation restructure, or a technology upgrade. It measured what happened when offices added plants.
That finding has held up to scrutiny in a way that other workplace environment claims have not. This post makes the business case in the terms that actually drive office and facilities decisions: output per employee, recruiting and retention, and the cost of a plant program relative to the payroll it is meant to support.
What the Research Actually Shows
The University of Exeter study, published in the Journal of Experimental Psychology and conducted across offices in the United Kingdom and the Netherlands, found that employees working in offices with plants reported 15 percent higher productivity and 6 percent higher reported well-being than those in comparable offices without them. The research design controlled for other environmental variables and specifically examined the effect of plant density on cognitive performance and reported satisfaction.
The mechanism is not purely psychological, though that component is real. Access to natural elements, including vegetation, has documented effects on sustained attention, cognitive fatigue, and stress response. The research literature on this effect is consistent enough that it forms one of the evidence bases for the WELL Building Standard, the performance framework developed by the International WELL Building Institute and adopted by a growing number of commercial office buildings as a certification standard for human health and well-being in the built environment.
WELL’s Biophilia domain specifically addresses the integration of natural elements into workspace design, including plant material, as a component of environments that support cognitive function and reduce occupant stress. Certification under WELL carries tangible commercial value for landlords and tenants in competitive office markets.
Beyond productivity, research consistently links access to natural elements in the workplace with lower reported stress, reduced absenteeism, and higher scores on measures of job satisfaction. A study from the Human Spaces Institute found that employees with access to natural light and greenery reported 15 percent higher scores on well-being and 6 percent higher scores on productivity, with view of nature from the workspace independently predicting reported satisfaction with the work environment.
For employers managing return-to-office programs, where the question of why the office is preferable to home is active and consequential, the workplace environment itself is a meaningful lever.
What These Numbers Mean for Your Payroll
The productivity literature is frequently cited in general terms and rarely translated into specific cost comparisons. Here is a straightforward version.
A professional interior landscaping program for a 5,000-square-foot office, which would cover a meaningful plant presence across a floor plate of that size, runs in the range of a few hundred to a few thousand dollars per month depending on plant selection, density, and maintenance scope. On an annual basis, a program in that range costs the equivalent of a fraction of one employee’s salary.
The productivity gains documented in the research literature, even at a conservative figure well below the 15 percent the Exeter study found, represent multiples of that investment in recovered output across even a small workforce. The math does not require assuming the most optimistic research figures to produce a compelling return.
This is the comparison that tends to land with CFOs and operations executives who are skeptical of workplace wellness framing: the cost of a plant program is a rounding error relative to the payroll it supports, and the evidence for its effect on output is more robust than most workspace interventions at any price point.
Recruiting, Retention, and the Physical Workplace
The employer value proposition has become a more active conversation since 2021, and the physical quality of the workplace is one component of it that employers can directly control.
Research from CBRE on office occupier preferences consistently identifies access to green space, natural elements, and daylight among the features that employees rate as most meaningful in evaluating an office environment. Properties and tenants that have invested in biophilic design, including live plant programs, perform better in employee satisfaction surveys than those that have not.
For employers in competitive hiring environments, the physical workspace is a recruiting asset. A thoughtfully planted office communicates investment in the employee experience in a way that is visible during interviews, tours, and early impressions. For retention, the consistent research finding is that employees who report a positive physical work environment are more likely to remain and to recommend the organization to others.
The WELL Building Standard provides a third-party certification that formalizes this investment for tenants and landlords who want to make the quality of the workplace environment part of their market positioning.
What Biophilic Design Actually Does (and Doesn’t Do)
The research on office plants includes one claim that has received significant popular attention and that does not hold up: the idea that indoor plants meaningfully clean the air. The 1989 NASA Clean Air Study is frequently cited as evidence that plants remove volatile organic compounds from indoor air. A 2019 meta-analysis of the relevant literature, published in the Journal of Exposure Science and Environmental Epidemiology, found that the rate of air cleaning produced by plants at typical office densities is negligible. A plant or two per room does not measurably reduce VOC levels. Ventilation systems and outdoor air exchange are the actual mechanisms that determine air quality.
This does not undermine the case for office plants. It just locates the real benefits accurately: in cognitive performance, stress modulation, occupant well-being, and the psychological effects of working in an environment that incorporates natural elements. These effects are well-documented and replicated. The air quality claim is not, and it does not need to be true for the business case to hold.
For an overview of how plant design translates into workplace environments, our Interior Landscape Design post covers the design principles behind effective interior plant programs in commercial spaces.
What an Interior Plant Program Looks Like
A professional interior plant service handles selection, installation, and ongoing maintenance as a single program. This matters because plant health in indoor commercial environments requires attention that on-site staff are rarely positioned to provide consistently: appropriate species selection for light conditions and HVAC environments, watering and fertilization schedules, pest monitoring, and seasonal rotation for flowering plants.
The result is a plant inventory that stays healthy and presentable year-round rather than cycling through replacements as poorly maintained plants decline. For tenants and landlords focused on sustainable landscaping practices, professionally maintained interior programs also reduce waste from plant replacement and support the kind of long-lived planting investment that reflects genuine commitment to the built environment.
Frequently Asked Questions
How many plants does an office actually need to see a benefit?
The research suggests that density matters: a single plant in a corner produces different results than a meaningfully planted floor plate. The University of Exeter research specifically found that lean offices, defined as those with no plants, produced lower productivity and well-being scores than enriched offices, which had plants throughout the space. A practical starting point for a mid-sized office is at least one plant per 100 square feet of occupied space, concentrated in areas where employees spend the most continuous time, including workstations, conference rooms, and common areas. A professional interior landscape assessment can map the right density and placement for the specific floor plan.
Do office plants actually clean the air?
At typical office densities, no, not in any meaningful way. The 1989 NASA Clean Air Study is frequently cited in support of this claim, but subsequent research has consistently found that the rate of VOC removal by plants is negligible compared to normal building ventilation. The number of plants required to produce measurable air quality improvement in a standard office would be impractical to maintain. The real and well-supported benefits of office plants are cognitive and psychological, not atmospheric: better concentration, reduced stress response, and higher reported well-being among employees who work in naturally enriched environments.
What does an interior plant service cost, and is it worth it?
Program costs vary with office size, plant selection, and maintenance scope, but a professionally maintained interior plant program for a typical office floor is generally priced in a range that represents a small fraction of the payroll it supports. The more relevant question is the comparison between program cost and the value of the output effects the research documents. Even a conservative estimate of productivity improvement across a small team produces a return that is a multiple of the program cost. For employers who are already investing in other workplace amenities, furnishings, or technology to support productivity, interior plants offer an unusually strong evidence base and an unusually modest price tag.
How Bayscape Landscape Management Can Protect Your Property Investment
The business case for office plants is not a wellness trend. It is grounded in peer-reviewed research, reflected in professional standards like WELL, and cost-effective relative to virtually any other investment with a comparable effect on employee output.
Bayscape Landscape Management, together with our wholly owned subsidiary Arbortek Tree Services, is a local, family-owned and operated landscape management company with a thirty-year heritage of reliability and performance. From small beginnings, our company has grown to become one of the leaders in the landscaping industry, entrusted with maintaining the Bay Area’s most beautiful commercial and residential landscapes. Our single objective is to transform your exterior into a picture-perfect space, as breathtaking as it is functional.
Our interior landscaping team works with Bay Area office tenants, building owners, and facilities managers to design and maintain plant programs that reflect both the aesthetic and functional goals of each space. From initial species selection and installation to ongoing maintenance, we manage the program so that the plants perform as intended without adding to the operational load of your team.
You may have been recommended to us by one of our many satisfied customers, or you may have searched online for interior plant service or office plants in the Bay Area. However you found us, we’re glad to have you. Call Bayscape Landscape Management at (408) 288-2940 or contact us online for an interior landscape assessment and program proposal.