If you want a tough, fragrant rosemary that also looks great in the garden, Rosmarinus officinalis 'Salem' is a strong choice. This upright, evergreen shrub has narrow, needlelike leaves with a bold, piney aroma and a steady supply of small, pale blue flowers when conditions are right.
Give your plant full sun for best growth and strongest flavor, and focus on drainage above all else. You will get the healthiest, most resilient plant in sandy or gritty soil, or in a raised bed where water never lingers. Water regularly while it establishes, then let the soil dry slightly between deep waterings. In humid or rainy periods, avoid overhead watering to keep foliage fresh.
At maturity, expect a tidy, upright form around 24-36 inches tall, with a narrower spread that can be shaped. Light trimming after flowering helps keep it dense and encourages new shoots for harvesting. Avoid hard cuts into old, leafless wood, which can be slow to resprout. Harvest sprigs as you need them, and use the leaves fresh or dried for cooking.
In cooler areas near the edge of its hardiness, you will have the easiest success in a container so you can move it to a protected spot for winter. Place it where it gets bright light, reduce watering, and keep the potting mix just barely moist so roots stay healthy.