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This long-lived perennial is sturdy and tough. White flowers in spikes have long lash-like stamens and the leaves have a pungent, lemony smell from the slightly flammable gas emitted on warm days. (People with sensitive skin had best not fondle this plant.) Don't worry, it's not a fire hazard, but you can impress people if you put a match to it on July 4th. Poof!
Minimum temperature: -40° F