What kind of tree is this?

Asked September 4, 2016, 12:35 PM EDT

I have these trees popping up all over my yard. At first I thought they were cool but they are like weeds so now I dig them out. You can view an album of photos at the link but I've also uploaded a few including pics of the whole tree, the bark/trunk, and a branch with fruit. The berries are the size of small blueberries and start out green but turn dark purple when the ripen.

Macomb County Michigan

1 Response

Looks like common buckthorn Rhamnus cathartica. It is an invasive species.
Here is some more information.