Muscari armeniacum 'Blue Spike' (d)

RHS Plant Profile

grape hyacinth 'Blue Spike'

Bulbs

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A vigorous, clump-forming, bulbous perennial to 20cm high, with narrow, linear green leaves. In spring, produces large, densely packed spikes of small, scented, double blue flowers with white tips. Foliage dies back after flowering and new leaves are produced in autumn

Position

Full sun

Soil Types

Chalk, Clay, Loam, Sand

Max Height

0.1-0.5 metres

Max Spread

0.1-0.5 metres

Size

Time to Maturity: 1–2 years
Max Spread: 0.1-0.5 metres
Max Height: 0.1-0.5 metres

Growing Conditions

Chalk Clay Loam Sand

Moisture: Moist but well–drained or Well–drained
pH: Acid or Alkaline or Neutral

Position

Full sun

Aspect: South–facing
Exposure: Exposed or Sheltered
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): H6

Colour & Scent

Fragrance Flower

Season	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family: Asparagaceae
Native to GB/Ireland: No
Foliage: Deciduous
Habit: Clump forming
Potentially harmful: Ornamental bulbs - not to be eaten. Wear gloves and other protective equipment when handling Pets: Ornamental bulbs - not to be eaten - see the HTA guide to potentially harmful plants for further information and useful contact numbers
Genus: Muscari are bulbous perennials with linear or strap-shaped leaves and small bell-shaped, tubular or urn-shaped flowers borne in a dense raceme on an erect leafless stem
Name Status: Accepted

How to Grow

Cultivation

Plant 10cm deep in autumn in any moderately fertile, well-drained soil. Lift and divide congested clumps in summer to maintain vigour. Spreads readily in good conditions; good for naturalising in meadows and wildlife gardens - see bulbs: naturalising

Propagation

Propagate by division of established clumps, separating offsets when dormant in summer

Suggested planting locations and garden types

City and courtyard gardens
Cottage and informal garden
Patio and container plants
Rock garden
Wildflower meadow
Wildlife gardens
Gravel garden
Banks and slopes
Garden edging

Pruning

No pruning required

Pests

Generally pest-free

Diseases

May be susceptible to fungal infections including anther smuts and bluebell rust (see rust diseases), and bacterial soft rot and some virus diseases