Cultivars
'Compacta'
This perennial succulent has a very compact symmetrical growth habit up to 250mm (9¾ in) tall by 300mm (12 in) wide with dark green leathery leaves that are 150mm (6 in) long by 50mm (2 in) wide and have numerous curly white fibres along the margins. The apex has a pungent spine and the flowers are similar to the species and appear high above the foliage from late spring to early summer. It is an ideal plant for patio pots and planter boxes and is suitable for small or arid gardens.
 
'Durango Delight'
This slow growing perennial succulent forms a dense symmetrical growth habit up to 300mm (12 in) tall by 457mm (18 in) wide. It has very dark fleshy broad lanceolate leaves with entire margins that have white curly fibres and the plant grows in zones 8-10. 
 
'Black Widow'
This perennial succulent has a very compact symmetrical growth habit up to 300mm (12 in) tall by 457mm (18 in) wide with dark green leathery leaves with silvery markings and the margins have white curly fibres. It is an ideal potted specimen plant and grows in zones 8-10. 

'Shira ito no Ohi'	
Queen of White Thread Century Plant
This solitary compact perennial succulent grows to 300mm (12 in) tall by 457mm (18 in) wide. It has dark green lanceolate leaves with a creamy white border and curly white marginal fibres. It grows in zones 8-10 and is planted in rockeries in full sun or used as a potted specimen and grows in zones 8-10.