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Cyperus involucratus

Cyperus involucratus
Papyrus

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More information

Graden Merit
Cyperus involucratus, a crown of small greenish-white flowers.
Height at maturity
1.50 m
Spread at maturity
60 cm
Exposure
Sun
Hardiness
Hardy down to -9°C
Soil moisture
Damp soil
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Recommended planting time March to May
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F
M
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M
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N
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Flowering time August to October
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F
M
A
M
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O
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Description

Very close to Cyperus alternifolius, a native to Madagascar. The stiff stems with triangular cross-section, emerging from the rootstock, bear at their tip a crown of 10 to 20 linear leaves, narrower than those of C. alternifolius, but wider than those of C. papyrus. In late summer, a crown of small white-greenish flowers appears on long pedicels. A beautiful and highly graphic species that adds a lot of character to a small water feature.

Cyperus involucratus in pictures

Cyperus involucratus (Flowering) Flowering
Cyperus involucratus (Foliage) Foliage

Flowering

Flower colour green
Flowering time August to October
Flowering description Greenish-white umbels.

Foliage

Foliage persistence Evergreen
Foliage colour medium green
Foliage description Deciduous, linear.

Plant habit

Height at maturity 1.50 m
Spread at maturity 60 cm
Growth rate normal

Botanical data

Genus

Cyperus

Species

involucratus

Family

Cyperaceae

Other common names

Papyrus

Origin

Cultivar or hybrid

Product reference8890111

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Planting and care

This species can only be grown outdoors in the ground during winter in the mildest regions, as the rootstock must never freeze. However, we have successfully cultivated it in a large pot submerged under 20cm (8in) of water for several years, as it is very rare for ice to exceed 15cm (6in) in thickness in our ponds. In this case, the foliage completely disappears in winter, but it regrows without any issues in spring. The very "vigorous" rootstock cannot tolerate being confined for too long in a too small pot, which is why pot cultivation requires dividing the stump and repotting it every 3 years or so.

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Planting period

Recommended planting time March to May

Intended location

Suitable for Shaded rockery, Woodland edge, Undergrowth
Type of use Border
Hardiness Hardy down to -9°C (USDA zone 8b) Show map
Ease of cultivation Amateur
Planting density 5 per m2
Exposure Sun
Soil pH Any
Soil type Clayey (heavy), Silty-loamy (rich and light)
Soil moisture Damp soil, Clayey

Care

Pruning Pruning recommended once a year
Pruning time February to April
Overwinter Can be left in the ground

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