Evergreen rosemary is an attractive evergreen shrub with needle-like leaves and brilliant blue flowers. The flowers of evergreen rosemary persist through spring and summer, filling the air with a nice piney fragrance. This beautiful herb, mostly used for seasoning dishes, is also commonly used as ornamental plantings in the landscape. Rosemary plant care is easy. When growing rosemary plants, provide them with well-drained, sandy soil and at least six to eight hours of sunlight. These plants thrive in warm, humid environments and cannot take extremely cold temperatures. Since rosemary cannot withstand winters below 30 F. (-1 C.), it’s often better when growing rosemary plants to put them in containers, which can be placed in the ground and easily moved indoors during winter.