Blue False Indigo is toxic if it's eaten (even though it's technically a perennial legume.) All parts of the plant from flower buds and roots to leaves to stems can make people sick, even the sap.

Periwinkle plant is a vine-like perennial. It has evergreen leaves and small flowers. The flowers can be lavender, blue, purple, or white. But it is toxic to pets as well as invasive. To remove ...