What is wrong with my Linden tree leaf?

Asked June 17, 2020, 1:21 PM EDT

Some of my Linden leaves have a hard, 1/4" high projection sticking out of the top of the leaf. I did not see any diseases or insects on your website that explained this.

Dakota County Minnesota

1 Response

Those are nipple galls and are the trees response to some insects. They do not hurt the tree.