The genus Calluna contains just 1 species of perennial, evergreen shrub (Calluna vulgaris) with hundreds of cultivars. It naturally occurs in a range of moorland, bog, and heathland habitats around the world. In New Zealand, it is considered as an unwanted organism and a ban is in place for its sale and propagation. Similarly, in Australia, Calluna is on the alert list for eradication. It grows to between 40-70 cm tall, producing many bell-shaped flowers in late summer. Leaves and small and scale-like measuring 2-3 mm in length. It tends to dominate heath and moorland habitats, can handle grazing and regenerates effectively following fires.