Dianella caerulea 'Cassa Blue'

Dianella caerulea 'DBB03', commonly known as Cassa Blue®, is a compact, clump-forming perennial from the Asphodelaceae family, renowned for its striking blue foliage. Reaching approximately 50 cm in height and 40 cm in width, this cultivar is well-suited for mass plantings or as a specimen plant in both residential and commercial landscapes.

From September to November, Cassa Blue® produces an abundance of baby blue flowers with purple and yellow accents, adding vibrant color to gardens. These blooms are followed by attractive purple berries that persist into summer. 

This Dianella thrives in full sun to partial shade and is tolerant of drought and cold conditions. It prefers well-drained soils and may require drier conditions in regions like Sydney. Cassa Blue® is particularly popular in coastal areas of Western Australia and South Australia due to its ability to withstand windy coastal conditions.

For optimal growth, water the plant as needed during the establishment phase (8-13 weeks) and ensure it is planted in a well-mulched garden with chunky mulch. Avoid placing the crown or base of the plant below soil or mulch level. If necessary, apply slow-release fertilizer in spring. To maintain its appearance, remove older leaves as required or cut back halfway every 3-5 years; more frequent pruning every 3 years may yield better results depending on specific requirements. 

Cassa Blue® is suitable for various regions, including the Australian Capital Territory, Victoria, South Australia, Western Australia, Tasmania, and New South Wales (north of Sydney only for maintained gardens). In Queensland, it is recommended only for maintained gardens.

With its rich blue foliage, extended flowering period, and low-maintenance nature, Dianella caerulea 'DBB03' Cassa Blue® is an excellent choice for gardeners seeking a durable and visually appealing addition to their landscapes.