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 a 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. Dig in plenty of compost before planting, water in well, and mulch to keep roots cool.
Watering & feeding
Cassa Blue Flax Lily handles dry conditions well once established. As an Australian native, feed it only with a low-phosphorus native fertiliser. New plantings need closer moisture checks in hot or windy weather, with watering tapered once strong new growth appears.
Pruning & care
Prune Cassa Blue Flax Lily after flowering to keep it compact and encourage the next flush of blooms. Expect a low maintenance care workload once it is established.
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 easier irrigation and care, group Cassa Blue Flax Lily with species that also favour very drought tolerant and subtropical climate. Leave enough room for the mature spread so neighbouring plants are not crowded out. 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. Catalogue forms are planning guidance until the Plant Sale team confirms live availability.
