Rosemary is a perennial evergreen shrub with blue flowers. It is an aromatic and distinctive herb with a sweet, resinous flavor. This plant is ideal for a rock garden or the top of a dry stone wall. In warm areas with fair humidity, rosemary can grow into a shrub several feet in height. In fact, it grows so vigorously in ideal conditions that can become a bit of a burden, if not managed properly!
This herb can be grown outdoors as a perennial shrub in Zones 7 and warmer. In colder areas, it should be kept in a pot and brought indoors for the winter.