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Lithodora diffusa Cambridge Blue

Lithodora diffusa Cambridge Blue
Purple Gromwell

3,5/5
1 reviews
0 reviews
0 reviews
1 reviews
0 reviews

Dried plants, with only the "green" tips. Revival subject to serious doubt..

Evio, 23/09/2023

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This plant carries a 12 months recovery warranty

More information

Small undershrub with a loose habit, covered with magnificent star-shaped flowers, tender blue.
Flower size
1 cm
Height at maturity
15 cm
Spread at maturity
40 cm
Exposure
Sun, Partial shade
Hardiness
Hardy down to -20°C
Soil moisture
Dry soil, Moist soil
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Recommended planting time February to April, September to November
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Flowering time May to June
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Description

The Lithodora diffusa Cambridge Blue differs from other grommets by the color of its flowers which are a soft blue almost purple. The Lithodora are delightful undershrub tapetums that are covered in flowers in spring.

 

The flowers are star-shaped trumpets, they stand out perfectly against a beautiful dark green foliage that is semi-evergreen, giving a luminous effect.

This plant thrives in the company of heathers for example, as their requirements are similar. It is also a good rockery plant and it thrives in dry and well-drained soils.

Lithodora diffusa Cambridge Blue in pictures

Lithodora diffusa Cambridge Blue (Foliage) Foliage

Flowering

Flower colour blue
Flowering time May to June
Flower size 1 cm

Foliage

Foliage persistence Evergreen
Foliage colour green

Plant habit

Height at maturity 15 cm
Spread at maturity 40 cm
Growth rate normal

Botanical data

Genus

Lithodora

Species

diffusa

Cultivar

Cambridge Blue

Family

Boraginaceae

Other common names

Purple Gromwell

Origin

Cultivar or hybrid

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Planting and care

Like heathers, the Lithodora diffusa Cambridge Blue hates limestone but can tolerate a poor, sandy soil, even a clay soil as long as it is very well-drained. Good drainage improves the hardiness of this plant, making it highly resistant to winter cold.

Planting period

Recommended planting time February to April, September to November

Intended location

Suitable for Rockery, Shaded rockery
Type of use Edge of border, Container, Slope
Hardiness Hardy down to -20°C (USDA zone 6b) Show map
Ease of cultivation Amateur
Planting density 5 per m2
Exposure Sun, Partial shade
Soil pH Acidic, Neutral
Soil type Silty-loamy (rich and light), Stony (poor and well-drained)
Soil moisture Dry soil, Moist soil, free draining

Care

Pruning No pruning necessary
Overwinter Can be left in the ground
3,5/5
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