A compact Australian native flax lily with upright blue-grey strappy foliage, sprays of small blue flowers and shiny purple berries. A versatile, hardy choice for borders, mass plantings and pots.
At a glance
- Plant type: Ornamental grass
- Mature size: 50 cm H × 50 cm W
- Aspect: full sun and part shade or morning sun
- Water: very drought tolerant once established
- Frost: hardy
- Maintenance: low maintenance
- Origin: Australian native
About Cassa Blue Flax Lily
Botanically, Dianella caerulea 'Cassa Blue' is an moderate-growing ornamental grass in the Asphodelaceae family, native to Australia. It reaches around 50 cm tall and 50 cm wide at maturity, with evergreen and silver-grey foliage. Blue flowers appear in spring and summer.
Where to grow Cassa Blue Flax Lily
Cassa Blue Flax Lily suits subtropical, warm-temperate and cool-temperate climates and grows best in full sun and part shade or morning sun. It is frost hardy and shrugs off cold winters. It also is a genuinely water-wise choice and tolerates salt-laden coastal winds.
Soil & planting
Cassa Blue Flax Lily does best in clay, sandy and free-draining soil. Plant into well-prepared ground, firm the soil around the roots and water deeply to settle it in.
Watering & feeding
Cassa Blue Flax Lily is very drought tolerant once established, so once its roots are down it needs little supplementary water. As an Australian native, feed it only with a low-phosphorus native fertiliser. In its first year, water deeply once or twice a week to settle the roots in, then taper off as it establishes.
Pruning & care
Prune Cassa Blue Flax Lily after flowering to keep it compact and encourage the next flush of blooms. Overall it is low maintenance.
Using Cassa Blue Flax Lily in the garden
Cassa Blue Flax Lily earns its place for a feature or specimen planting, holding soil on banks and slopes and drawing nectar-feeding birds into the garden.
Companion planting & design
For a cohesive, low-care bed, pair Cassa Blue Flax Lily with other plants that enjoy the same very drought tolerant and subtropical climate. Repeat it through a border to tie the planting together and give a sense of rhythm. It combines naturally with other Australian natives in a habitat or water-wise garden.
Buying Cassa Blue Flax Lily
Plant Sale lists Cassa Blue Flax Lily as potted plants. Stock isn't live yet — register your interest using the panel above and we'll email you the moment we have it ready.