Cultivars
'Albus'
This clump forming plant has dark green strap-like leaves and produces white flowers during summer. It grows in full sun to semi shade and tolerates most well drained soils. It has a low water requirement once established. (Scale: 1-drop from 3)

'Baby Blue' syn. Dwarf Blue or White
This dwarf plant grows 250mm (9¾in) to 600mm (2ft) tall forming clumps with strap-like leaves. It produces rounded flower heads that are cornflower blue during the warmer months of the year. 

It tolerates full sun to shaded positions on most well drained moist soils and is suitable for coastal positions. It has a low water requirement once established (Scale: 1-drop from 3) and responds to mulching and an occasional watering during dry periods.

'Black Pantha'
This clump forming perennial has dark green strap-like leaves and produces dark purple trumpet-shaped flowers that are arranged in a ball-like flower head held above the foliage on a tall stem appearing during late spring to early summer. 

It is used in border or mass plantings and is suitable for patio pots. It has a low water requirement once established (Scale: 1-drop from 3), responding to mulch and an occasional deep watering during dry periods.

'Flore-pleno'
This smaller clump forming plant produces double blue flowers during summer and grows in a full sun to semi shaded position. It prefers a well drained moist fertile soil but will tolerate most conditions. 

It has a low water requirement once established (Scale: 1-drop from 3) and responds to mulching and an occasional watering during dry periods.

'Maximus'
This strong growing upright plant form clumps and produces large blue flowers. It will grow in most soils and in most positions and It has a low water requirement once established (Scale: 1-drop from 3) and responds to mulching and an occasional watering during dry periods.

'Snowball'
This small perennial and grows to 400 mm (16 in) tall by 300 mm (1 ft) wide forming a clumping habit.  It has a strap like to green leaves and produces pure white trumpet shaped flowers that are held above the foliage on a slender scape during early summer.  

It prefers an open sunny to semi shaded position, and grows in moderately fertile soils, tolerating dry conditions and coastal positions.  It is planted in small gardens along borders for edging or may be grown in patio pots.

'Tinkerbell'
This clump forming plant grows to 800mm (32in) tall with strap-like leaves that are pale-green with cream margins. It produces violet blue flowers during summer and is an ideal plant for a rockery or edging pathways pool side planting. 

It grows in a full sun to semi shaded position on well drained soil. It has a low water requirement once established. (Scale: 1-drop from 3)
  
'Variegatus'
This clump forming plant has variegated white strap-like leaves and produces small blue flowers during summer. It prefers a full sun position on well drained fertile moist soils. It has a medium water requirement once established. (Scale: 2-drops from 3)