Toxicological trivia from December 04, 2013: Tropaeolum majus is an ornamental plant originating in the Andes from Bolivia north to Colombia.  It is a widespread annual, glabrous, succulent and. There are numerous varieties with red, orange or yellow flowers, the calyx has five sepals and the corolla five unequal petals. It is widely cultivated, both as an ornamental plant and as a medicinal plant.They can be used; a) To add to salads;b) They have other culinary uses;c) Both  previous responses are correct.

Correct answer is c. See more images.  Read more in WP.