Sarcococca hookeriana var. digyna ' Purple Stem' (' Purple Stem' sweet box) has been called the best of the sweet box by none other than plantsman Dan Hinkley. And with its raspberry-colored stems ...

Purple deadknettle produces small purple flowers and jagged, heart-shaped leaves that emerge from a single, central stem. Part of the mint family, it is a low-growing plant of 2 to 8 inches.

Purple shamrocks are a complete standout with deep violet and green leaves and stems. They’re pretty popular as a houseplant, but can be grown outdoors as they thrive in direct sunlight. 11.