You may have heard a gardener say that getting their hands in the soil makes them feel better, and maybe you’ve felt that way yourself. It turns out there’s real science behind that feeling. A tiny, harmless soil microbe called Mycobacterium vaccae (my-koh-bak-TEER-ee-um VAK-kay) may actually stimulate serotonin production in the brain, offering a natural mood lift and even some cognitive benefits.
Do you love the smell of dirt? Does being in the garden just make you feel good? M. vaccae lives in healthy soil and becomes airborne or skin-accessible whenever we dig, plant, weed, or harvest. Studies suggest that exposure to this bacterium can activate pathways in the brain that increase serotonin, the neurotransmitter tied to emotional balance, focus, and overall well-being. We come into contact with it naturally through inhalation, skin contact, or even tiny amounts on homegrown vegetables. That everyday exposure may help explain why gardening is so consistently linked to reduced stress and improved mood.
The benefits don’t stop at emotional health. Some research shows that exposure to diverse soil microbes may help strengthen the immune system and even reduce the risk of conditions like asthma in children raised around gardens or farm environments.
And of course, being outside in the garden brings other perks. Sunlight helps your body produce vitamin D, which supports bone health, immune function, and mood. Low vitamin D levels are associated with a range of issues, including depression and chronic pain, so a little sunshine while you garden can go a long way.
Spending time in the garden also supports mental health in broader ways: reducing anxiety and stress, improving attention and mindfulness, boosting creativity and productivity, and enhancing memory. Some studies even suggest gardening may help reduce the risk of dementia by up to 50%. It’s also been shown to support people coping with PTSD and to increase overall happiness and life satisfaction.
There are endless reasons to be in the garden, but taking care of yourself while doing something you love is one of the best. Gardening isn’t about perfection, it’s about trial and error, learning as you go, and the satisfaction of growing something with your own hands. Connect with your community, share produce and tips, help your neighbor, and allow yourself to be helped. We don’t have to do any of this alone.
Miranda Huston, Horticulture Program Assistant
https://blog.nwf.org/2011/03/its-in-the-dirt-bacteria-in-soil-may-make-us-happier-smarter/
https://pmc.ncbi.nlm.nih.gov/articles/PMC6334070/
https://jeh.kglmeridian.com/view/journals/jenh/37/1/article-p30.xml