Variations
'Frosty'
This perennial succulent is commonly referred as at a cultivar but it is a natural sub-species found in San Miguel.  It is similar to the species but has a more silvery appearance on the foliage. It forms a rosette that is up to 150 mm (6 in) in diameter and forms a low spreading habit.

'Ruby Blush'
This cultivar or variety of the species produces foliage that has Ruby red margins that vary in intensity depending on light and temperature.  In bright cool climates the red markings are more prominent.

'Ruby'
This perennial succulent is similar to the species and producers foliage with rosy coloured tips and or margins. In bright cool climates the red markings are more prominent.