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Geranium wallichianum Crystal Lake - Wallich's Cranesbill

Geranium wallichianum Crystal Lake
Wallich's cranesbill, Himalayan geranium

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This perennial geranium has many qualities. Its large flowers are an extraordinary crystalline mauve-lavender colour, intensely veined with violet and bloom from July until the first frost above marbled and toothed foliage. Its long, running stems carpet the ground, in the sun or partial shade. Hardy, very floriferous, and highly tolerant, it only dislikes waterlogged soils in winter.
Flower size
4 cm
Height at maturity
30 cm
Spread at maturity
60 cm
Exposure
Sun
Hardiness
Hardy down to -18°C
Soil moisture
Moist soil
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Best planting time February to April, September to October
Recommended planting time February to April, September to November
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Flowering time June to November
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Description

The perennial Geranium wallichianum 'Crystal Lake' combines many qualities. Its large flowers of an extraordinary crystal lavender mauve, highlighted with white in the centre and intensely veined with purple, bloom from July until the first frost above marbled and toothed foliage. Its long, creeping stems carpet the ground, in full sun or partial shade. It is hardy, very floriferous and highly tolerant, it only dislikes waterlogged soils in winter.

 

Geranium wallichianum 'Crystal Lake' belongs to the Geraniaceae family. It is a selection obtained in 2002 in the Netherlands, the result of self-pollination of G. wallichianum 'Silvery Blue'. This plant originates from Geranium wallichianum, a wild Himalayan species (from Afghanistan to India), where it grows up to approximately 3600 m in altitude, on the slopes, in the forests and among the shrub hedges. 'Crystal Lake' has a dense and spreading habit, reaching 30 cm (12in) high with a minimum spread of 60 cm (24in), sometimes up to 1.20 m (4ft) if the conditions are right. This geranium has a particularly long flowering period, from July to November. The cup-shaped flowers measure 4 cm (2in) in diameter and are a luminous and refined very pale mauve with purple veins. They become more mauve as the first cold weather arrives. The foliage is evergreen, marbled light green with caramel tones, turning red in autumn. The leaves are deeply lobed and wavy, with toothed edges. This creeping perennial sends out 60 cm (24in) long, branching stems that lie on the ground without rooting. It has a specific root system, with a central and unique taproot, and a few large fibrous secondary roots.

 

Perennial Geranium wallichianum 'Crystal Lake' is ideal for borders, moist rockeries, and flower beds. In partial shade, it will thrive in a flower bed, alongside Campanula 'Burghaltii' and Pulmonaria 'Diane Claire' with their beautiful silvery foliage. It can also be planted on top of a wall, in a semi-shaded rockery where it will lean, with its base in the shade and its head in the sun, among columbines, Chiastophyllum oppositifolium, or Chrysogonum virginianum. It likes to creep under low branches of shrubs, where will only suffocate weeds.

Geranium wallichianum Crystal Lake - Wallich's Cranesbill in pictures

Geranium wallichianum Crystal Lake - Wallich's Cranesbill (Flowering) Flowering

Flowering

Flower colour mauve
Flowering time June to November
Inflorescence Cluster
Flower size 4 cm

Foliage

Foliage persistence Evergreen
Foliage colour light green

Plant habit

Height at maturity 30 cm
Spread at maturity 60 cm
Growth rate normal

Botanical data

Genus

Geranium

Species

wallichianum

Cultivar

Crystal Lake

Family

Geraniaceae

Other common names

Wallich's cranesbill, Himalayan geranium

Origin

Cultivar or hybrid

Product reference802291

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Planting and care

This perennial geranium enjoys dappled but not scorching sunlight. Plant it in moist, humus-bearing soil with minimal limestone, but make sure it is well-drained. It particularly dislikes waterlogged soil during its early stages, especially in winter. Plant it early in spring or in autumn. Water regularly to aid the establishment of young plants. The faded flowers can be regularly pruned to encourage re-blooming. This easy-going plant requires little maintenance.

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Planting period

Best planting time February to April, September to October
Recommended planting time February to April, September to November

Intended location

Suitable for Meadow, Rockery
Type of use Border, Edge of border
Hardiness Hardy down to -18°C (USDA zone 7a) Show map
Ease of cultivation Beginner
Planting density 3 per m2
Exposure Sun
Soil pH Neutral
Soil type Silty-loamy (rich and light), Stony (poor and well-drained)
Soil moisture Moist soil, well-drained

Care

Pruning instructions After flowering, it is a good idea to cut back the stems and leaves to ground level to prevent excessive self-seeding, encourage new leaf growth and promote a second flowering.
Pruning Pruning recommended once a year
Pruning time July to August
Disease resistance Very good
Overwinter Can be left in the ground

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