The black walnut tree (Juglans nigra) is well-loved for its beauty and the walnuts it grows. However, the roots of this tree produce juglone, a chemical released in the soil surrounding the tree that ...

Black walnut trees have high levels of the toxin juglone, in all parts of the tree, including roots and leaves. Why keep black walnut trees? They are one only a few nut trees that survive in cold ...

Spring gardening season is just around the corner. As you wait, you may have questions. For answers, turn to Ask an Expert, an online question-and-answer tool from Oregon State University’s Extension ...

For many urban gardeners, a black walnut is not a friendly tree. Though black walnut is valued for its fine quality timber, it has a detrimental property that inhibits many plant species from growing ...

Many Midwestern yards are adorned by black walnut trees. The black walnut (Juglans nigra) is a large, handsome native tree that bears edible nuts. There’s just one problem with black walnuts: They’re ...

Q We bought a home with black walnut trees in the yard. They're lovely trees, but I have trouble growing things near them. I've heard that black walnuts are poisonous to other plants. Is that true?

Walnut trees are very special additions to the yard, offering spring yellow-green catkins and delicious walnuts in fall. While they can seem intimidating to grow, a little perseverance can make your ...

Q: I'm trying to identify the tree in the photo. I've been told that the nuts are not edible. Can you help? - Scott Bundy. A: The tree in the photo is black walnut, Juglans nigra, and it's a ...

This week's gardening column explains when to prune roses, butterfly bushes, and walnut trees, plus the benefits of no-till gardening.