25/04/2026
Research shows playing in the dirt isn't just fun — it's critical to health.
And studies show it transforms children's immune systems in just 28 days.
A groundbreaking experiment in Finland replaced gravel and asphalt in nursery playgrounds with patches of forest floor, complete with mosses, leaf litter, and wild undergrowth.
The results were stagg
ering: within just 28 days, children who played in these rewilded yards developed more diverse skin and gut microbiomes along with higher levels of regulatory T-cells. This suggests that the biodiversity hypothesis—the idea that our sterile urban environments are linked to rising allergy and autoimmune rates—is a tangible reality we can change by simply reintroducing nature's microbial network to our daily lives.
This shift from aesthetic gardening to functional micro-biodiversity is the driving force behind modern rewilding efforts. Whether you manage a sprawling backyard or a small city balcony, introducing native leaf litter, moss, and living substrates serves as a direct investment in human health. By replacing sterile surfaces like gravel or rubber with living ones, we are doing more than creating wildlife corridors; we are rebuilding the microbial foundation essential for human resilience. Embracing natural complexity—dirt and all—is a foundational step toward a healthier future for both our families and the planet.
source: Roslund, A. S., Puhakka, R., Grönroos, M., Nurminen, N., Oikarinen, S., Gazali, A. M., ... & Sinkkonen, A. (2020). Biodiversity intervention enhances immune regulation and health-associated commensal microbiota among daycare children. Science Advances.
WE HAVE DOUBLE WASHED PLASTER SAND (BEACH SAND) ON OUR PLAYGROUNDS AT THE COW JUMPED OVER THE MOON.
SOFT LANDING, GREAT FOR SENSORY PLAY AND BRILLIANT FOR IMMUNE SYSTEMS .
