The Society's chief horticultural scientist, Tijana Blanusa, along with Reading University found that having certain plants indoors can be great for your skin. How? Because of transpiration, in which plants lose water through their leaves and keep the air moist. It's like having a full-time humidifier on, yet without the electricity and slimy parts that need to be cleaned.
“House plants may be a simple and affordable way to reduce air dryness indoors and alleviate symptoms of dry skin," Blanusa says in The Telegraph, "while providing multiple other benefits – for human psyche and physical health.”
The best plants for this purpose are generally the thirsty ones with higher transpiration rates and with a lot of surface area.
“In our study of seven varieties the best performing were peace lily (Spathiphyllum) and ivy (Hedera) but there are likely to be many other species whose characteristics lend themselves to the job and need to be tested still," Blanusa explains.
She says that an 11-inch by 20-inch peace lily can transpire the equivalent water of a small teacup a day.
Blanusa also touches upon the air-cleaning benefits, which we've written about before: “Additionally, plants capture dust and particles from the indoor air, so again large leaf areas are good to provide this benefit. A number of chemical compounds such as those found in paints and furnishings, as well as gasses emitted in cooking and burning can be removed by houseplants. More needs to be known however about the exact numbers of plants, and their combinations required to elicit an effect on a room scale and remove multiple compounds well.”
I can only imagine that removing pollutants from the air would benefit one's skin as well.