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pyruscalleryana4636 | by Bob Richmond
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pyruscalleryana4636

Fruit of the Callery pear, Pyrus calleryana, about 10 mm. Ten Mile Creek Greenway, Knoxville TN, August 22nd, 2010.

 

This seriously invasive tree arises from the rootstocks onto which Bradford pear trees are grafted. The Bradford cultivars are sterile (though they fruit), but the wild-type rootstock trees produce wholly fertile seeds which are spread by birds. What I call "Martha Stewart trees" because of their perfectly symmetric storybook shape really shouldn't be planted at all, at least in areas where "calleryana hells" have not yet established themselves. (Where I live the damage has been done.)

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Taken on August 23, 2010