Discover Iowa’s Largest Miyawaki Forest: A Bold Step by the University of Iowa for a Greener Future

The University of Iowa has created the largest Miyawaki forest in Iowa, transforming an underused area near Hillcrest Residence Hall. Around 4,000 native seedlings now thrive there, forming a new mini-ecosystem.

The Miyawaki method, pioneered by Japanese botanist Akira Miyawaki, involves planting native trees and shrubs closely together. Unlike traditional forests, where trees can be spaced several feet apart, this approach encourages quick growth as plants compete for sunlight. The result? A dense, self-sustaining forest that supports local wildlife.

This project took shape a few years ago when the Office of Sustainability partnered with students. They selected a sloped area of campus, which was a challenge to maintain, for this initiative.

Andy Dahl, the campus arborist, explains, “This space was tricky to mow. Instead of risking injury, we decided to turn it into a living ecosystem.” The forest includes 23 different tree species, all with similar growth rates, ensuring a balanced environment. Fast-growing species like Cottonwood and Silver Maple were excluded to prevent any one type from overshadowing the others.

The forest aims to improve local biodiversity, enhance air quality, and manage stormwater effectively. It’s also a great resource for teaching and research, allowing students and faculty to engage in hands-on learning.

This Miyawaki forest is Iowa’s second, exceeding the first located in Brookview Park, which has 1,200 trees. Beth MacKenzie, the university’s Sustainability Program Manager, anticipates an uptick in local wildlife, stating, “With so many species planted, we expect to see a boost in diversity among birds, mammals, and insects.”

Over 400 volunteers, including students and community members, dedicated four days to the planting. Their collective effort demonstrates a strong community commitment to sustainability.

To learn more about this initiative, visit the University of Iowa’s sustainability page.

This project not only contributes to environmental well-being but also reflects a broader trend. Many cities are adopting similar methods to combat urbanization’s effects on green spaces. The Miyawaki method has garnered attention globally, with cities in countries like India and Brazil implementing their own versions to restore ecosystems.

By nurturing more green spaces, we’re not just enhancing our surroundings; we’re taking steps toward a sustainable future.

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