Heather (Calluna) are low-growing evergreen shrubs. Fond of moist, acidic soils, these plants are strongly associated with heathland, moorland, and the regions and countries where those habitat types or prominent (such as Scotland and Ireland). Often planted ornamentally, heather can be tricky to grow if soil is insufficiently acidic. In addition to being culturally and ornamentally significant, this plant serves as an important a food source for grazing mammals, several species of birds, and many species of insects.