American Pokeweed
American Pokeweed is one of the most common plants you’ll find in America, and most likely in your backyard. Don’t be fooled by its purple-black berry, also known as pokeberry. It’s highly toxic. If ingested, you’ll experience nausea, low blood pressure, and vomiting. Children are especially susceptible, since they may mistake the berries for grapes. Even though it’s at the low end of the toxicity scale, especially compared to other plants on this list, it’s still not recommended to ingest because of the horrible symptoms (Best Life Online).