After centuries of breeding, there are more than two thousand cultivars of Camellia japonica! Additionally, there are more than a thousand cultivars of both Camellia sasanqua, with smaller but more profuse flowers, and comparably rare Camellia reticulata, with fewer but garishly big flowers. This does not even include the more than a hundred other specie of camellia found in the wild throughout East Asia.
It is obviously difficult to generalize about so many different personalities. Actually though, the glossy and slightly serrate leaves of almost all Camellia japonica are surprisingly similar. Also, most grow into rounded shrubs that are happy to stay below first floor eaves. Only a few grow into small trees, and only after many years. All prefer rich soil and regular watering.
The flowers that bloom late in winter are the most distinguishing characteristics of the many cultivars. The largest can get more than four inches wide. Flower form is remarkably variable (and can be described as single, semi-double, double, formal double, paeony, anemone or rose). Many have prominent yellow stamens. Color ranges from pure white to red, with every shade of pink in between. Picoteed, striped and blotched flowers are not uncommon.