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dianella cassa blue height

Dianella 'Cassa Blue' is a popular, compact landscape plant prized for its stunning blue foliage and low-maintenance nature. If you’re considering this variety for your garden, understanding the typical Dianella Cassa Blue height is a must for seamless design and plant pairing. Perfect for both residential and commercial applications across New Zealand, this Dianella delivers impact and style in borders, mass plantings, or containers.

Dianella 'Cassa Blue'

Dianella 'Cassa Blue' bears spikes carrying delicate, light blue flowers, which are followed by small, blue berries in summer. These are held neatly above the blue-green leaves as it grows to 80 cm tall and the same width. Dianella 'Cassa Blue' is an easy-to-grow plant that is ideal for planting under existing trees and shrubs, including in cottage gardens, planting around outdoor living areas, or maintaining in a container.

Dianella caerulea 'Cassa Blue' plants with blue-green foliage.
  • Suited to regions:
    All regions
  • Plant type:
    Flaxes
  • Height:
    80 cm
  • Spread:
    80 cm
  • Flowering time:
    Spring
  • Tolerances:
    Coastal, Extended dry periods, Hardy, Wind
  • Garden uses:
    Borders, Containers, Living areas, Paths & Steps, Ponds, Pool areas
  • Garden styles:
    Architectural, Backyard, City & Courtyard, Coastal, Frontyard, Japanese, Mediterranean, Modern
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Dianella 'Cassa Blue'

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How Tall Does Dianella Cassa Blue Grow?

The average Dianella Cassa Blue height is around 40–50 cm, with a similar spread. This tidy, clumping form ensures it remains neat and controlled, making it an excellent choice for low hedges or groundcover. Unlike some larger Dianella cultivars, Cassa Blue won’t overtake your garden beds or crowd out neighbouring plants, so you can confidently use it for structured edging, in formal gardens, or even as a feature in contemporary landscapes.

Design Ideas Based on Dianella Cassa Blue Height

Given its modest maximum height, Dianella 'Cassa Blue' looks stunning when mass planted or arranged in drift patterns for a sea of silvery blue texture. It’s also a perfect understory plant beneath taller shrubs or trees. For gardens that use several different flax or Dianella varieties, combine Cassa Blue with taller or differently coloured relatives to highlight its compact growth. Try pairing with Dianella Blaze for warm bronze tones, or mix with Phormium 'Raspberry Ripple' and Phormium 'Waitara Gold' for striking contrast.

Care and Positioning for Optimal Growth

To ensure your Dianella Cassa Blue reaches its full height and retains vibrant colouring, plant in full sun or partial shade. This variety is adaptable to most soils but prefers well-drained spots. It’s highly drought-tolerant once established, perfect for low-water gardens and New Zealand’s varied climates.

Trim spent flower stems or tidy up foliage annually to keep the plant neat. If your design requires other forms or heights, explore options like Dianella 'Little Jess', which grows even more compact, or Dianella Kentlyn for a taller look.

Exploring Similar Plants for Your Garden

If you love the Dianella Cassa Blue height and compact look, you might also enjoy siblings like Dianella 'Little Rev' or the lush and lush Dianella Goddess. For a more architectural style, Cordyline Lime Fountain provides a vertical accent that complements Dianella’s form. Those seeking a more unique statement might find Dianella Florero or Dianella Paroo Lily perfect additions to their planting scheme.

Your Next Step to a Beautiful Landscape

Whether for borders, pots, or mass plantings, understanding the typical Dianella Cassa Blue height ensures you get the desired look and scale. Its easy care, adaptability, and true-blue foliage make it a versatile favourite for New Zealand gardens. Consider pairing with other Dianellas and flaxes for a cohesive, textural design that thrives season after season.


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Celebrate your favourites like Ficus Tuffi and Coprosma acerosa, then branch out with Camellia 'Fairy Blush', Coprosma 'Beatsons Brown', and Kunzea ericoides.
–The Plant Company

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