Is this poison ivy?

Asked May 21, 2018, 6:08 PM EDT

Is the large patch in the first picture poison ivy, or immature Boston ivy? We have Boston ivy growing all over the fence behind this patch, but I wasn't sure. For reference, the second picture is a single plant from another area of the yard that I'm fairly certain IS poison ivy, and its leaves look pretty different. Thoughts?

Allegheny County Pennsylvania horticulture

1 Response

Hello, and thanks for using the Ask an Expert System,

Poison ivy is a plant that can display a wide variety of leaf characteristics. I am certan that the plant in the second photo is poison ivy. The first photo may be poison ivy, but I am less certain about its identification. I would recommend that you treat them both as poison ivy to be safe.

For more information see the Penn State Extension fact sheet Poison Ivy.

If you have additional questions, I suggest that you contact the Allegheny County Penn State Master Gardener Gardenline. This is a free service offered through the Penn State Extension Office to help Allegheny County residents with gardening questions and concerns. You can reach them by phone at 412-482-3476, or 412-482-3477, or by Email:

Allegheny County Penn State Extension Office