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The Callery pear tree, known for its elegant white flowers that mark the arrival of spring, has become a threat to eastern ecosystems. While it was once a popular ornamental plant, it has been considered invasive for some time. Starting on January 1st, Ohio became the first state to ban the planting and distribution of this tree.
The Callery pear (Pyrus calleryana) is originally from Asia and was introduced to North America by USDA scientist Frank Meyer in the early 1900s. Initially, it was seen as a beneficial addition because it was resistant to fire blight, a common bacterium affecting pears. This resistance helped alleviate financial burdens on farmers. The tree also thrives in various environments, making it adaptable and appealing.
However, as the tree matured, significant issues arose. Ed Kapraly, the owner of Riverside Native Trees and Nursery, points out that these trees now have few positive qualities. For example, the Bradford pear variety, a type of Callery pear, is fragile and poses safety risks to people and property. While new varieties have been developed to address some of these issues, they still grow much faster than native plants, competing for sunlight and other resources.
Initially, Callery pears were thought to be non-invasive because they couldn’t self-pollinate. However, it was discovered that different varieties of the tree could cross-pollinate when in close proximity to each other. This led to the growth of unwanted thorns and fruits with seeds that birds easily spread.
Dealing with these invasive trees is challenging. Cutting them down is not straightforward, and their roots can only be removed when the tree is young. Even then, it’s a difficult process. Professional removal by an arborist can be expensive. One method is to cut the tree as close to the roots as possible and then treat it with a high-concentration glyphosate solution of at least 25 percent.
For those who miss the Callery pear tree, there are alternative local options. Kapraly suggests considering alternatives like Black Tupelo and Serviceberry.
