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Strobilanthes attenuata Blue Carpet

Strobilanthes attenuata Blue Carpet
Mexican Petunia

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This strobilanthe is a perennial, deciduous ground cover which forms large herbaceous clumps of ovate, hairy leaves with strong veins. Its dense spikes of beautiful blue-violet, tubular flowers appear from August until the frost. This hardy Himalayan plant is easy to grow, tolerant even of impoverished soil under bushes and happy in the sun in cool climates, but it prefers partial shade or shade. Lovely autumn colours.
Flower size
2 cm
Height at maturity
80 cm
Spread at maturity
80 cm
Exposure
Sun, Partial shade, Shade
Hardiness
Hardy down to -23°C
Soil moisture
Moist soil
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Best planting time March, October
Recommended planting time February to June
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Flowering time August to October
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Description

Strobilanthes attenuata Blue Carpet is relatively unknown to gardeners but is nevertheless a pretty,perennial,hardy and easy to grow groundcover. It is comfortable even in impoverished soil under shrubs and forms herbaceous clumps that are quite tall, adorned with dense spikes of beautiful blue-violet tubular flowers from late summer until frost. These flowers bloom above abundant oval, hairy, strongly veined leaves which colour beautifully in autumn. This deciduous Himalayan plant can adapt to the sun in cool climates, but generally prefers partial shade or shade.

 

Strobilanthes attenuata is one of the few hardy species in this genus, which includes over 250 species, mostly native to Madagascar or tropical-temperate Asia. It belongs to the same family as acanthus, the Acanthaceae. The 'Blue Carpet' cultivar differs mainly in the colour of its flowers. The plant forms a woody-based clump of upright stems, reaching 80 cm (32in) to 1.20 m (4ft) in all directions, depending on growing conditions. The stems are characterized by swollen nodes and bear opposite, oval, toothed, matte green leaves. The bright blue-violet flowers are composed of 5 unequal lobes and have a curious flared and bent tube shape, grouped in tight inflorescences at the top of the branches. The foliage turns purplish-pink in autumn before disappearing in winter. This plant spreads in width through lateral stems that produce roots, spontaneously layering.

 

Strobilanthes are still relatively unknown, despite being a remarkable and useful perennial and hardy species for shaded areas. Strobilanthes 'Blue Carpet' will thrive on the edge of a woodland or under a hedge, even in soil filled with roots. It can be grown here with small periwinkles, dead nettles, or even Waldsteinia ternata. Further north, this plant will tolerate a sunny exposure, for example in a rockery with dwarf asters or tall sedums. In warmer regions, it is better to plant it in a shaded border with ferns, Japanese anemones, or Actaea simplex. In partial shade, its large blue spikes will complement the golden plumes of Solidago rugosa or the rays of Ratibida pinnata.

Strobilanthes attenuata Blue Carpet in pictures

Strobilanthes attenuata Blue Carpet (Flowering) Flowering

Flowering

Flower colour blue
Flowering time August to October
Inflorescence Cluster
Flower size 2 cm

Foliage

Foliage persistence Deciduous
Foliage colour medium green

Plant habit

Height at maturity 80 cm
Spread at maturity 80 cm
Growth rate normal

Botanical data

Genus

Strobilanthes

Species

attenuata

Cultivar

Blue Carpet

Family

Acanthaceae

Other common names

Mexican Petunia

Origin

Cultivar or hybrid

Product reference810471

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Planting and care

This plant grows spontaneously in moist undergrowth preferring a sunny position in the cool and humus-bearing soil in the north. In warmer regions, it will do better planted in the shade. This perennial appreciates well-drained but moist soils which are  not too chalky. Prune the clump in late autumn, when it is no longer decorative.

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Planting period

Best planting time March, October
Recommended planting time February to June

Intended location

Suitable for Woodland edge, Undergrowth
Type of use Slope
Hardiness Hardy down to -23°C (USDA zone 6a) Show map
Ease of cultivation Amateur
Planting density 5 per m2
Exposure Sun, Partial shade, Shade
Soil pH Acidic, Neutral
Soil type Clayey (heavy), Silty-loamy (rich and light)
Soil moisture Moist soil, humus-bearing and fresh

Care

Pruning instructions Cut back the dry stems in late winter or late autumn.
Pruning Pruning recommended once a year
Pruning time March to April
Disease resistance Very good
Overwinter Can be left in the ground

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