 The flowers are dark pink, with a tubular base to the corolla 15 mm long with a narrow four-lobed apex 3–4 mm across, with a strong fragrance; they are produced in slender panicles up to 15 cm long in early summer.The fruit is a dry, smooth brown capsule, splitting in two to release the two winged seeds.Growing conditions allow for cool to temperate climate and are fully frost hardy.