Researcher considers native-plant gardening a matter of survival


AKRON, Ohio — To Douglas Tallamy, landscaping with native plants isn’t a matter of aesthetics or convenience.

It’s a matter of life and death.

Tallamy worries that the accelerating spread of non-native plants is tipping the balance of nature and threatening to destroy our environment.

It’s not just about losing some pleasing flowers and pretty birds. “It’s a matter of the future of life on this planet,” he said.

Tallamy is an authority on the importance of native plants and biodiversity.

As a professor of entomology and wildlife ecology at the University of Delaware and director of its Center for Managed Ecosystems, Tallamy studies the ways insects interact with plants and how those interactions affect animal diversity.

He has also watched those interactions play out on the 10 acres he and his wife own in southeastern Pennsylvania, and what he has seen troubles him.

When the couple bought the parcel in 2000, it was “10 acres of junk,” he said.

Alien plants accounted for more than a third of the plants, and curiously, they showed very little insect damage — much less than the native plants on the property, he writes in his book “Bringing Nature Home: How You Can Sustain Wildlife With Native Plants.”

To Tallamy, that was a red flag. The non-native plants weren’t damaged because the insects couldn’t use them for food or reproduction and pretty much ignored them.

He knew that with fewer desirable plants to support those insects, their numbers would decline.

That, in turn, would have negative consequences for the birds and other wildlife that eat those insects and the plants that depend on them for pollination.

And the effects would continue right on up the food chain.

About 80 percent of the plants in our yards are non-native, he said. That’s because most of us have fallen prey to the lure of exotic plants, which he said we tend to see as more desirable than the native plants that grow wild.

But those alien plants don’t play nice and stay put. They spread to our fields, forests, waterways and other areas, sometimes reproducing with abandon and choking out the native plants that are a vital part of nature’s system of checks and balances.

Already an industry is sprouting up around sustainable gardening, and Tallamy predicted more and more people will be hiring out their services to eradicate non-native plants and replace them with natives.

He recommended starting your eradication efforts with the biggest plants, and just focusing on eliminating a little bit every day.

Consider reducing the size of your lawn and bordering it with native plants.