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The Benefits of Indoor Plants

Posted on August 10, 2017 at 4:50 PM

The Effects of Indoor Plants on Health and Discomfort Symptoms

A Norwegian study from 1995-96 provides the best evidence for the health benefits of plants. The research team studied 60 office workers whom each experienced a plant and no plant condition during the spring months.

In the first year of the study, half of the subjects had a planter installed on their window sill and a large floor plant near their desks, while the other subjects experienced their standard office conditions without plants. The plants were grown in a mixture of Leca pears, peat, and compost. They were maintained by a professional service.

In the second year of the study, the conditions were reversed and the plants were moved to the workspaces of the no-plants group. The researchers studied health symptoms using a standardized survey instrument that measured:

Neuropsychological symptoms (fatigue, headache, concentration problems)
Mucous membrane symptoms (cough, sore throat, stuffy nose, eye irritation)
Skin problems (dry or flushed skin)

The analysis compared symptoms when plants were present and when they were absent. The results showed that:

Neuropsychological symptoms were reduced by 23% when plants were present. Fatigue reduced the most – by 30%
Mucous membrane symptoms were reduced by 24% overall when plants were present. Cough decreased by 37% and dry throat by 25%
Dry or flushed skin was reduced by 23% with plants in the workspace

The researchers suggest that health improvements were likely due to two mechanisms: improved air quality and the psychological value of being in a more pleasing environment. The presence of plants may have created a microclimate effect that resulted in increased moisture (which could influence mucous membrane systems) as well as a cleansing of the chemicals in the air.

Other studies have also found that plants can positively influence air quality, but there is much debate over how many and what types of plants would be required for effective removal of airborne toxins.

For instance, a 1989 study assessed the use of plants to remove formaldehyde and zylene from the air in test chamber studies. This research was prompted by an EPA study that found high levels of these chemicals in newly constructed office buildings in the 1990’s. The chemicals are commonly found in building materials and furnishings.

The researchers found that plants were effective in continuously removing the chemicals from the air in the test chambers. Both the plant leaves and the micro-organisms in the soil contributed to the improved air quality.

A more recent study in 2004, also conducted in a test chamber, found that plants removed airborne doses of benzene within 24 hours. Both the leaves and soil microorganisms proved effective in removal of the chemical from the air. The authors concluded that “the findings demonstrate the capacity of the potted plant microcosm to contribute to cleaner indoor air and to lay the foundation for the development of the plant system as a complementary biofiltration system.”

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