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Burncoose Nurseries - part of the Caerhays Estate
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  • DIANELLA caerulea 'Cassa Blue'
    DIANELLA caerulea 'Cassa Blue'
    © Burncoose Nurseries, all pictures for illustrative purposes only.
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    DIANELLA caerulea 'Cassa Blue' DIANELLA caerulea 'Cassa Blue' DIANELLA caerulea 'Cassa Blue' DIANELLA caerulea 'Cassa Blue'
    >

    DIANELLA caerulea 'Cassa Blue'

    Compact upright habit. Blue glaucous leaves and small purple flowers
    plant size comparison icon
    1.5 to 2 Litre   - Click to view photo
    Delivery Information
    Available late spring to early summer 2026
    £14.50 each 
    MULTIBUY SAVING
    Any 3+ £12.00 each
    Available late spring to early summer 2026 - Spring according to the Met Office is defined as March 1st - May 31st. Therefore late spring is mid-April onwards. This is not a guaranteed date but an estimate and subject to availability.
     
    Full Plant Details - Sun/Soil & other attributes
    • Flowering
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      Feb
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      Mar
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      Apr
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      May
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      Jun
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      Jul
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      Aug
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      Sep
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      Oct
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      Nov
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      Dec
    • Pests & Diseases
      Trouble free
    • Place of origin
      Eastern Australia, New Guinea
    • Evergreen
      Broadly lance-shaped, keeled, stiff leaves with rough margins
    • Panicles
      To 30cm (12in) long
    • Star-shaped
      Pendent flowers 1-2cm (½-¾in) long, with conspicuous anthers
    • Border
      Suitable for a sheltered, sunny border
    • Patio / pot plants
    • Frost hardy (down to -5)
    • Height
      60cm (24in)
    • Spread
      30cm (12in)
    • Bulb/Corm or rhizomatous perennial
      Rhizomatous perennial. Tufted perennial. Flowers are followed by spherical, shiny, blue berries
    • Half hardy - unheated greenhouse / mild winter
      Hardy in coastal and relatively mild parts of the UK except in severe winters and a risk from sudden (early) frosts. May be hardy elsewhere with wall shelter or good micro-climate. Likely to be damaged or killed in cold winters. Plant can withstand temperatures down to -5°C (23°F)
    • Summer Seasonal Interest
    • Fertile well drained soil
      Moderately fertile. Humus-rich
    • Neutral to acid soil
    • Full sun
      Shelter from cold winds
    • Partial shade
    • Mature Size
      60cm (24in)
      bulb/corm - guide for size not form Watering Can
        30cm (12in)
       
    View Detailed Plant Description

     

    View Planting Tips and Care Advice
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    Useful extras...

    Vermin & Pest Control
    Slug killer blue mini pellets are easy to use and give effective control of slugs and snails. Ideal in garden, conservatory or greenhouse.
    800g
    £6.50
    Fertilisers & Feeds - Empathy
    All-purpose organic concentrated seaweed feed that is a ready to use, derived from sustainable harvested kelp, that can be used on all outdoor and indoor plants, except acid loving plants. Perfect used in conjunction with Rootgrow™.
    1 ltr
    £8.50
    Fertilisers & Feeds - Empathy
    Recommended by the RHS. Contains Rootgrow™ mycorrhizal fungi. Suitable for all trees and shrubs (except rhododendrons, azaleas, heathers, cranberries and blueberries)
    Small - 60g sachet
    £3.00
    Medium - 150gm sachet
    £6.00
    Large - 360gram sachet
    £12.00
    Unavailable
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