Crocus biflorus 'Blue Pearl'

RHS Plant Profile

crocus 'Blue Pearl'

Synonyms

Crocus chrysanthus 'Blue Pearl'

Bulbs

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A small, perennial corm, with long, narrow, dark green leaves to around 8cm high, marked with a fine white stripe along the centre. Each corm produces up to four fragrant, light lavender-blue flowers, white within, with a yellow throat, opening in spring with the leaves

Position

Full sun

Soil Types

Chalk, Clay, Loam, Sand

Max Height

Up to 10 cm

Max Spread

0-0.1 metre

Size

Time to Maturity: 2–5 years
Max Spread: 0-0.1 metre
Max Height: Up to 10 cm

Growing Conditions

Chalk Clay Loam Sand

Moisture: Well–drained
pH: Acid or Alkaline or Neutral

Position

Full sun

Aspect: South–facing or East–facing or North–facing or West–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: Iridaceae
Native to GB/Ireland: No
Foliage: Deciduous
Habit: Tufted
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: Crocus are dwarf, deciduous perennials growing from a corm, with linear leaves usually with a silvery central stripe, and goblet-shaped, sometimes fragrant flowers in autumn or early spring
Name Status: Accepted

How to Grow

Cultivation

Grow in a gritty, poor to moderately fertile soil. See crocus cultivation for more advice

Propagation

Propagate by division of established clumps, by separating cormlets when dormant, or by seed sown in pots in a cold frame when ripe

Suggested planting locations and garden types

City and courtyard gardens
Rock garden
Gravel garden
Patio and container plants
Wildlife gardens
Flower borders and beds

Pruning

No pruning required

Pests

May be susceptible to rodents and birds

Diseases

Generally disease-free, corms may rot in storage