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dianella cassa blue size

Dianella ‘Cassa Blue’ is a standout choice for gardeners who want a compact, tidy, and low-maintenance ornamental grass. If you’re wondering about the dianella cassa blue size, its neat upright form, and how it fits into a planting scheme, look no further. This New Zealand favourite delivers bold blue-green foliage and works beautifully in beds, borders, pots, and mass planting.

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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What is the Typical Dianella Cassa Blue Size?

One of the most attractive qualities of Dianella ‘Cassa Blue’ is its compact growth habit. Typically, a mature plant reaches around 40-50cm in height and about 40cm wide. This makes it an ideal choice where you want lush texture without plants becoming overgrown or untidy. The moderate dianella cassa blue size allows it to be used in tight spaces, narrow beds, or as a consistent border edge.

How to Use Dianella Cassa Blue in Your Garden

Thanks to its manageable size, Dianella ‘Cassa Blue’ is an excellent choice for mass plantings, pathway edging, or as an accent among contrasting textures. Its blue-toned strappy foliage adds year-round interest, especially when paired with other drought-tolerant species. If you’re creating a cohesive palette, consider combining Dianella ‘Cassa Blue’ with related varieties such as Dianella 'Little Jess', which offers an even more compact option, or Dianella 'Little Rev' for a taller, strappy look.

This variety is equally at home in a coastal setting, contemporary garden, or native-style landscape. The modest dianella cassa blue size ensures you won’t have to worry about over-pruning or crowding nearby plants. Its ornamental flowers in spring and summer are an added bonus, appearing just above the foliage.

Dianella Cassa Blue vs. Other Ornamental Flaxes

Choosing the right size and style for your garden often comes down to the mature plant’s growth. While Dianella ‘Cassa Blue’ remains compact, you might want something taller or with different foliage tones. Consider Dianella Blaze for bolder foliage colour, or Dianella Goddess which grows larger for dramatic landscaping.

For gardeners interested in pairing with New Zealand native flax, Phormium ‘Pepe’ (Dwarf Flax) offers a similar compact size, while Phormium 'Pixie' (Pixie Flax) and Phormium 'Coffee' provide unique colour contrasts. For more substantial screening, Phormium tenax is a robust choice, or explore the distinctive tones of Phormium 'Moonraker' (Moonraker Flax).

Care, Spacing & Garden Planning

When planting Dianella ‘Cassa Blue’, allow for 30-40cm spacing to create a dense, seamless appearance. Its tidy size means less maintenance and less need for dividing. This variety thrives in full sun to part shade, handles drought once established, and suits a wide range of soil types.

If you’re looking for a dependable, striking, and easy-care plant, the dianella cassa blue size perfectly meets the needs of small and large New Zealand gardens alike. Pairing it with other dianella or phormium species ensures garden interest throughout the year with minimal effort.


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Whether you need assistance finding the plant you’re looking for or you simply want to know more about who we are and what we do, we invite you to get in touch with us today. A member of The Plant Company team will get back in touch as soon as possible.

Our garden favourites Chamaemelum nobile (Chamomile) and Dianella 'Little Jess' get lots of love, but don’t miss out on a few lesser-known delights: Rhaphiolepis Enchantress (Pink Indian Hawthorn), Melicope ternata, and Gleditsia triacanthos Sunburst.
–The Plant Company

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