Heirloom Herb. Rosemary seeds grow into a coarse, upright, bushy plant with pale blue flowers. An incredibly pleasing fragrance is released when the leaves are handled. There is no doubt that rosemary is an important (almost compulsory) component of poultry stuffing but it also goes hand-in-hand with lamb and pork dishes. Plants can grow from 60-90 cm (2-3′) tall. In most locations in Canada, it is recommended to bring rosemary inside to overwinter as temperatures below 8°C (46°F) for more than a day will damage foliage. We have reports from gardeners that rosemary fails to thrive when planted close to members of the potato family (Solanaceae).