Poison hemlock is invading Indiana. It’s not alone. These 5 poisonous plants are too. by socialtern | Aug 3, 2021 | General News | 0 comments Poison hemlock is a new invasive species frequenting Indiana’s roadsides, but it’s not alone. Here are poisonous plants to watch out for in Indiana. Source Submit a Comment Cancel replyYou must be logged in to post a comment.