Scarlet Barbs Published October 9, 2013 | By Bill It’s bright! It’s bold! It’s serrated! It’s red! It’s sumac in the fall! The slender green leaves of the sumac plant turn this bright red color when autumn arrives in N.E. Wisconsin. To view a larger version of this image, click on the photo. Related Posts:A Bold StandFall Creeping UpCrape Myrtle in BloomSlender Sunbather