A leaf’s visual characteristics — its size, perhaps, or the shape of its edges — can help tell its story, including the conditions it grows in and even traces of its evolutionary history.

Trees with especially unique leaves include ginkgo, sassafras, yellow poplar, and mulberry. Here, we explore the various classifications that foresters study when identifying trees by leaf shapes.

An apple may not fall far from the tree, but for a leaf, it depends on its shape. Elm or apple leaves — oval and symmetrical, with few protruding lobes — fall quickly, making them likely to ...

Join the conversation Ash tree infected with cottony ash psyllid, on a Saskatoon street. (photo by Jill Thomson) (for Saskatoon StarPhoenix Bridges gardening column, April 12, 2019) Saskatoon ...

"This spring, of course, a lot of the black ash trees were very late to leaf out, much like last year. But as they started to leaf out, the impact was even greater," she said.

In the four European tree species the researchers looked at: horse chestnut, scots pine, alder and ash, the time interval between leaf unfolding and flowering increased at a rate of 0.6 to 1.3 ...

The team investigated how the shape of the leaves of deciduous trees affects how they fall, using an "automated sedimentation apparatus" to conduct 100 free fall experiments a day on biomimetic ...

A: Your ash tree has a common foliage disease called ash anthracnose, which is showing up in the area because of the cool, wet spring. Leaves become distorted and some drop.

One of the most destructive tree pests in North America has reached all 99 counties in Iowa. Emerald ash borer is an invasive beetle that attacks and kills ash trees. The adults eat leaves while ...