Too Many Indoor Plants? How Greenery Can Stress You Out (Science Explained) (2025)

Imagine if nature itself were a prescription, a magical pill that could boost your well-being. Well, it's not just a fantasy! Research has shown that spending time in nature, be it a quick walk or a week-long camping trip, can significantly improve our overall happiness and health. But here's where it gets controversial: a recent study by Stanford engineers has revealed that the relationship between indoor nature and our well-being is more complex than we thought.

The study, published in Sustainable Cities and Society, found that while a moderate amount of indoor greenery can enhance our sense of restoration and belonging, too much of it can actually lead to increased stress levels.

"I was completely taken aback by the results," said Eva Bianchi, the lead author and a recent Stanford civil engineering PhD graduate. "It's a surprising finding, especially since previous research suggested the opposite."

The researchers developed a unique method to quantify different 'doses' of indoor nature, including potted plants, wooden materials, and nature views. They then tested the impact of these doses on various well-being measures.

What they discovered was fascinating. A room with around 20% greenery and wooden elements showed the strongest positive impact on participants' sense of restoration and belonging. However, when the greenery level increased to 60%, with plants looming overhead and a wooden ceiling, stress levels rose.

"It's like the plants were overwhelming the space," explained Sarah Billington, the senior author and UPS Foundation Professor at Stanford. "It's a delicate balance. Too much nature indoors can be counterproductive."

The study also highlighted the importance of feeling connected to nature. When participants reported a stronger connection to nature, they experienced greater well-being benefits from the indoor greenery.

"It's not just about filling a room with plants," Bianchi emphasized. "It's about creating an environment that fosters a sense of connection to nature for the people occupying that space."

So, the next time you're designing an indoor space, whether it's your home, office, or a public building, consider the 'dose' of nature you're incorporating. It's a fine line between enhancing well-being and causing stress. And this is the part most people miss: it's not just about the quantity of nature, but also about creating a connection to it.

What are your thoughts on this? Do you think we should be more mindful of the amount of nature we bring indoors? Share your opinions in the comments below!

Too Many Indoor Plants? How Greenery Can Stress You Out (Science Explained) (2025)

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