This slow-growing plant can reach 3 to 6 feet tall outdoors or 2 feet as a houseplant. Crown of thorns grows best outdoors as a perennial in warm zones 9 through 11. Grow it indoors in other zones ...

both evergreen plants are traditional Christmas symbols: the holly for part of the same reason as the Glastonbury Rose is, because it represents the Crown of Thorns that the Savior will wear ...