There are many edible flowers, such as marigolds, carnations and bee balm. But don't think you can pluck any comely blossom and pop it into your mouth. Several are harmful, including foxglove. Also known as fairy bells, rabbit flower, throatwort and witches' thimbles, foxglove grows to about 3 feet (1 meter) tall. It sports purple, pink or white flowers set along a central stalk. Its leaves are important to the medical industry, as they're used to make the heart drug digitalis. (Digitalis gets its name, incidentally, from foxglove's Latin name: Digitalis purpurea) [source: Lloyd].
But don't eat foxglove blossoms, its leaves or any part of this plant. If you do, you'll most likely develop nausea, vomiting, cramps and diarrhea. Your mouth will probably hurt, too. Perhaps the most dangerous thing is that the plant can affect your heart rate, thanks to the same components that make it great for producing digitalis [source: Lloyd].