I have been grooving on aeoniums since the early 90's and have really fallen for this "black" pigmented form.
This species originated in the Canary Islands which has comparable micro climates to San Francisco.
The deepest darkest colors of A. 'Schwartzkopf' are achieved with full sunlight; shade this plant and it will become green tinged.In winter the centers of the rosettes lose their black pigment turning green, they darken again in spring.
After two years some of my plantings are 4ft tall and finally blooming. The yellow flower spike on the black foliage is really beautiful.
Great for height and structure in a succulent garden.