According to Passiflora Online, all parts of the passion flower vine contain cyanide. As the fruit matures, quantities of cyanide drop in the fruit to the point where it can be eaten safely. As a rule, consider all parts of the plant, with the exception of the ripe fruit, as being toxic.
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In Jacksonville, Fla., Frank Whittemore is a content strategist with over a decade of experience as a hospital corpsman in the U.S. Navy and a licensed paramedic. He has over 15 years experience writing for several Fortune 500 companies. Whittemore writes on topics in medicine, nature, science, technology, the arts, cuisine, travel and sports.