In the villages of India's Western Ghats, some of the oldest and tallest trees don't grow inside a national park. They grow in sacred groves, small patches of old forest that local communities have protected for generations because they believe the trees belong to their deities and ancestors. A new study found these groves are doing something remarkable: they're growing the next generation of forests.
The research, published in the journal PLOS One, focused on Vanzole village in India's Western Ghats, a mountain range stretching about 1,600 kilometers down the country's west coast. A team from the Applied Environmental Research Foundation, working with local experts Namdev and Anant Shivgan, measured 82 giant trees—those more than 1 meter around—from 20 different species. What they discovered was striking: sacred groves held nearly twice the number of giant-tree species found in nearby villages, and 12 species grew only in the groves.
Why does this matter? The researchers found that young trees regenerate far more successfully in these protected patches. Seeds dropped by fruit-eating birds like hornbills are much likelier to survive and grow there than in surrounding farms and villages. In the villages, people mostly plant mango and jackfruit for their fruit. But in the sacred groves, medicinal trees like the beheda and the fishtail palm thrive alongside old-growth species that birds need.
Kevin Matteson, a researcher at Miami University who co-authored the study, explained that giant trees act like what he called "ecological catcher's mitts." Large birds like hornbills perch on their strong branches and thick crowns, then drop seeds across the land as they fly. But once a seed lands in a village, it often gets trampled, eaten by livestock, or cleared away. In the sacred groves, the ground stays undisturbed, so young trees sprout and survive.
The numbers tell the story. Fishtail palm saplings grew under 91 percent of grove trees but only 47 percent of village trees. Jayant Sarnaik, of the Applied Environmental Research Foundation, compared watching a great hornbill try to perch on a small tree to "watching an adult try to balance on a toddler's plastic chair."
India has more than 100,000 sacred groves, recognized as essential to community-based conservation. But they're under pressure. Simple forest shrines are increasingly replaced with concrete temples, and young people are leaving villages for cities, taking their knowledge of these forests with them. The researchers argue that conservation should protect whole forests and the cultures around them, not just individual animals. As Matteson put it, "Settlements are curated orchards, while sacred groves are ecological time capsules."