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Epipactis gigantea

Epipactis gigantea
Giant Helleborine

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This is a large hardy terrestrial orchid, easy to grow, showing flower stems combining brown, orange-yellow and red from May to July. It appreciates moist to wet, light, slightly acidic soils, in full sun or partial shade.
Flower size
4 cm
Height at maturity
70 cm
Spread at maturity
30 cm
Exposure
Sun, Partial shade
Hardiness
Hardy down to -29°C
Soil moisture
Moist soil, Damp soil
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Best planting time March to April
Recommended planting time February to April, September to November
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Flowering time May to July
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Description

Epipactis gigantea, also known as the Helleborine, is a large and hardy terrestrial orchid that produces typical orchid flower spikes, combining brown, orange-yellow, and red colours. This unique spring to summer flowering lasts several weeks. It is equally beautiful in slightly damp flowerbeds as well as on the banks by water, and it also thrives in pots. It prefers moist to wet, light, slightly acidic soils, in full sun, or partial shade.

Epipactis gigantea is a plant belonging to the orchid family. This botanical species is native to the western states of the USA and northern Mexico. In the wild, it grows along watercourses in constantly wet to damp humus-rich soils. It is a perennial plant with fleshy rhizomes, easily reaching 70-80 cm (28-32in) in height and 40 cm (16in) in width. Its deciduous vegetation emerges from the ground in spring and disappears in autumn. It has four to twelve sheathing and lanceolate leaves measuring 5 to 15 cm (2 to 6in) long, from which a terminal inflorescence emerges, displaying up to 15 flowers with a diameter of 3.5 cm (1in). They bloom from May to June to July. Each flower has three light brown or greenish sepals veined with darker lines and two reddish-brown petals veined with purple. The labellum is cup-shaped with a pointed protuberance, brighter and more distinctly veined in reddish-brown, often marked with yellow. The flowering is followed by the formation of a pendant capsule measuring 2 to 3 cm (1in) long, containing thousands of small seeds.

Epipactis gigantea is a unique, yet natural-looking plant that is easy to incorporate into damp flowerbeds or along water bodies, alongside Japanese primroses, Euphorbia palustris, or even astilbes that thrive in the same conditions. It also grows well in pots without any special protection.

When you receive your orchids, handle them with care: these plants have few roots and are delicate!

Epipactis gigantea in pictures

Epipactis gigantea (Flowering) Flowering

Flowering

Flower colour multicoloured
Flowering time May to July
Inflorescence Cluster
Flower size 4 cm

Foliage

Foliage persistence Deciduous
Foliage colour medium green

Plant habit

Height at maturity 70 cm
Spread at maturity 30 cm
Growth rate normal

Botanical data

Genus

Epipactis

Species

gigantea

Family

Orchidaceae

Other common names

Giant Helleborine

Origin

North America

Product reference804261

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Planting and care

The cultivation of Epipactis gigantea is easy on the edge of a stream, on a rocky subsoil, in a peaty, porous, moist and rather acidic soil. It dislikes suffocating, heavy and impermeable soils. This plant appreciates full sun or partial shade. In the ground, its roots dislikes stagnant waterlogging in winter. In a pot, use a mixture of 60% ericaceous soil, 20% horticultural compost and 20% coarse sand. It will be necessary to ensure that the substrate remains constantly moist.

In fact, it needs water constantly, but without waterlogging, as this can be fatal to it in winter.

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Planting period

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

Intended location

Suitable for Shaded rockery, Woodland edge, Undergrowth
Type of use Border
Hardiness Hardy down to -29°C (USDA zone 5) 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)
Soil moisture Moist soil, Damp soil, Humus-rich, well-draining

Care

Pruning No pruning necessary
Disease resistance Very good
Overwinter Can be left in the ground

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