Here are the worst irritating, poisonous and invasive plants — the ones you should always avoid. It's covered with pretty, purple flower spikes from late summer through fall. A long-lived ...

Monkshood Monkshood is one of the most poisonous plants in your garden ... arrow-shaped leaves that have purple spots on them. There is a flowering spike that has a yellow and green hood ...

Rubber vine is toxic and inhaling dust from dried plant ... the plants in their yards growing as shrubs. Shiny leaves and purple flowers led to the plants’ popularity as an ornamental, and ...