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  • AGM plants

    AGM plants have been through a rigorous trial and assessment programme. They are:

    • Excellent for ordinary use in appropriate conditions
    • Available to buy
    • Of good constitution
    • Essentially stable in form & colour
    • Reasonably resistant to pests & diseases
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Hosta sieboldiana var. elegans

giant blue hosta

AGM plants

AGM plants have been through a rigorous trial and assessment programme. They are:

  • Excellent for ordinary use in appropriate conditions
  • Available to buy
  • Of good constitution
  • Essentially stable in form & colour
  • Reasonably resistant to pests & diseases
RHS Plant Shop from £4.99 Sold by 42 nurseries

  • Other common names giant blue hosta

  • Synonyms Hosta 'Robusta'
    Hosta 'Blue Angel'

    Hosta 'Blue Sieboldiana Elegans'
    Hosta 'Elegans'
    Hosta 'Elegans'
    Hosta 'Robusta'
    Hosta glauca

    see more

  • Family Asparagaceae

  • Genus Hosta are clump-forming herbaceous perennials with simple, ovate or lance-shaped leaves, often attractively coloured or variegated, and erect racemes of nodding, funnel or bell-shaped flowers in early summer

  • Details H. sieboldiana var. elegans is a perennial forming a large clump of puckered, broad, blue-grey leaves to 20-30cm in length. Lilac-tinged white, bell-shaped flowers in dense racemes on stems to 75cm

  • Plant range Japan

Characteristics

  • Foliage Deciduous

  • Habit Clump-forming

  • Hardiness

    Hardiness ratings

    All ratings refer to the UK growing conditions unless otherwise stated. Minimum temperature ranges (in degrees C) are shown in brackets

    • H1a - Under glass all year (>15C)
    • H1b - Can be grown outside in the summer (10 - 15)
    • H1c - Can be grown outside in the summer (5 - 10)
    • H2 - Tolerant of low temperatures, but not surviving being frozen (1 to 5)
    • H3 - Hardy in coastal and relatively mild parts of the UK (-5 to 1)
    • H4 - Hardy through most of the UK (-10 to -5)
    • H5 - Hardy in most places throughout the UK even in severe winters (-15 to -10)
    • H6 - Hardy in all of UK and northern Europe (-20 to -15)
    • H7 - Hardy in the severest European continental climates (< -20)

    H7

Colour

Sunlight

  • Partial Shade

  • Aspect East-facing or North-facing or West-facing

  • Exposure Sheltered

Soil

  • Clay

    Clay

  • Loam

    Loam

  • MoistureMoist but well-drained

  • SoilClay, Loam

  • pHAcid, Neutral

Size

  • Ultimate height 0.5-1 metres

  • Ultimate spread 0.5-1 metres

  • Time to ultimate height 2-5 years

How to grow

Cultivation Grow in fertile, moist but well-drained soil in part shade with shelter from cold, dry winds. See hosta cultivation

Propagation Propagate by division in late summer or early spring

Suggested planting locations and garden types Ground Cover Cut Flowers Flower borders and beds Underplanting of Roses and Shrubs City & Courtyard Gardens Cottage & Informal Garden Patio & Container Plants

How to care

Pruning Remove spent foliage as required and clear up dead foliage when it dies back at the end of the growing season

Pests Plants in pots may be susceptible to vine weevil. This cultivar is said to be resistant to slugs

Diseases May be subject to a virus

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Hosta sieboldiana var. elegans

giant blue hosta

Buy from £4.99 at the RHS Plants Shop

Buy from £4.99 at the RHS Plants Shop

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