Rosmarinus officinalis 'Blue Spires' is a vigorous, upright evergreen shrub prized for its striking columnar form, aromatic culinary foliage, and profuse deep blue flowers. This popular rosemary variety forms a tall, narrow, upright bush with stiff, branching stems covered in linear, needle-like, gray-green to silvery-green leaves that release a strong, classic rosemary scent when brushed. The leaves are edible and widely used in roasted meats, potatoes, breads, herb oils, and infusions. From late winter through spring, and often sporadically into summer, it produces an abundance of small, two-lipped, tubular, deep violet-blue flowers arranged along vertical spikes, creating a stunning display that is highly attractive to bees, butterflies, and other pollinators. With its excellent tolerance for heat, drought, salt spray, deer, and poor soils, and its naturally upright, columnar habit, it is an outstanding choice for hedges, screens, specimen plantings, herb gardens, Mediterranean landscapes, and large containers.