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Epipactis thunbergii x gigantea

Epipactis thunbergii (x) gigantea
Giant Helleborine, Stream Orchid

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A large garden orchid resulting from the cross-breeding between a species native to Japan and an American species. The result is a vigorous plant that is hardy and relatively easy to cultivate in the conditions it prefers, namely a slightly moist, light, well-drained soil with a slightly acidic tendency in non-scorching sunlight or partial shade.
Flower size
4 cm
Height at maturity
75 cm
Spread at maturity
40 cm
Exposure
Sun, Partial shade
Hardiness
Hardy down to -20°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 June to August
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Description

The Epipactis thunbergii x gigantea is a terrestrial orchid resulting from cross-breeding between an Asian species and an American species. It is a vigorous variety, with numerous floral buds that bloom into quite showy flowers, ranging in colour from orange to bronze, with a yellow lip marked with orange. They blossom for several weeks starting from June. To acclimate it, provide it with a light, moist, humid soil that is not waterlogged, rich in humus, and slightly acidic. 

The Epipactis thunbergii x gigantea belongs to the orchidaceae family. It is the result of cross-breeding between Epipactis thunbergii and Epipactis gigantea. The former is a species native to Japan and colder regions of Northeast Asia. The latter, locally known as Stream Orchid, is native to the western states of the United States and northern Mexico. The Epipactis thunbergii x gigantea is a perennial plant with fleshy rhizomes, reaching a height of 70 to 80 cm and a width of 40 to 50 cm. Its deciduous vegetation emerges from the ground in spring and disappears in autumn. It consists of stems with 4 to 12 sheathing and lanceolate leaves measuring 5 to 15 cm long. Flowering occurs from June to August and can be more or less early, depending on the climate. The flower spike bears up to 15 flowers with a diameter of 4 cm. Each flower has three sepals and two petals. The lip is cup-shaped with a pointed protuberance. The flowers range from shades of orange to bronze, with a yellow lip marked with orange. The flowering is followed by forming a pendulous capsule measuring 2 or 3 cm long, containing thousands of tiny seeds.

The Epipactis thunbergii x gigantea is a robust plant not afraid of the cold. Very beautiful in flower beds or on the banks of water points, this perennial can also be grown in pots. In the garden, it prefers moist soil and makes an excellent streamside plant in a lightly shaded area. Despite its original appearance, it is also a plant with a natural look, easy to integrate into the garden. Combine it in a mass planting of moist to humid soil with willowherbs, meadowsweets, Japanese primroses, and astilbes that appreciate the same conditions and make beautiful subjects. Don't forget about Osmund ferns as well.

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

Flowering

Flower colour orange
Flowering time June to August
Inflorescence Solitary
Flower size 4 cm

Foliage

Foliage persistence Deciduous
Foliage colour medium green

Plant habit

Height at maturity 75 cm
Spread at maturity 40 cm
Growth rate normal

Botanical data

Genus

Epipactis

Species

thunbergii (x) gigantea

Family

Orchidaceae

Other common names

Giant Helleborine, Stream Orchid

Origin

Cultivar or hybrid

Planting and care

The cultivation of the Epipactis thunbergii x gigantea is relatively easy if one recreates its habitat: the bank of a stream or pond, on a rocky subsoil, in a humus-bearing and peaty, porous soil, consistently moist to wet, preferably acidic. It fears suffocating, heavy, clayey soils that are not well-aerated and impermeable. This plant appreciates full sun or partial shade. In open ground, its roots fear stagnant moisture in winter. Use a mixture of 60% peat soil, 20% horticultural compost, and 20% coarse sand in a pot. It will be necessary to ensure that the substrate remains consistently moist.

It needs constant water but not stagnant humidity, as this can be fatal in winter. However, the soil should never completely dry out. Pay attention to watering in summer, especially if the plant is exposed to the sun. Avoid scorching exposures, such as the afternoon sun in warmer climates.

Planting period

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

Intended location

Suitable for Meadow, Woodland edge, Pond edge
Type of use Border, Container
Hardiness Hardy down to -20°C (USDA zone 6b) Show map
Ease of cultivation Experienced
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-bearing, well-draining

Care

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

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