Lemon Verbena
This herb lends a lightly floral, bold citrus flavor to drinks with, say, apricots, peaches, bananas, berries, and tropical fruit; used in fruity cocktails and sangrias, vodka lemonades, or lemon drop martinis. (You can even use it to make your own homemade bitters.)
Grow it: Look for seedlings around late spring and plant them in containers you can place in sunny, sheltered spaces.
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Photo: (cc) Gisela Francisco/Flickr