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Conservatory Greenhouse

Angraecum sororium

A cool-growing orchid forming clumps of upright stems with 2 rows of stiff, strap-shaped shiny green leaves. The plant is found growing in habitat among boulders and rocks and decaying leaf litter, in the highlands of central Madagascar, often in almost full sun, although this is mediated by frequent fog and mists. Up to 4 waxy, moderately long lasting, white flowers, with a green spur-like nectary, are produced on a single flower stem from January to March, and are spicily night scented

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Ultimate height

0.5–1 metres

Time to ultimate height

5–10 years

Ultimate spread

0.1–0.5 metres

Moisture

Moist but well–drained

pH

Neutral

	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Full sun
Partial shade

Aspect

East–facing or North–facing or South–facing or West–facing

Exposure

Sheltered

Hardiness
Hardiness ratings
All ratings refer to the UK growing conditions unless otherwise stated. Minimum temperature ranges (in degrees C) are shown in brackets
H1a: under glass all year (>15C)
H1b: can be grown outside in the summer (10 - 15)
H1c: can be grown outside in the summer (5 - 10)
H2: tolerant of low temperatures, but not surviving being frozen (1 to 5)
H3: hardy in coastal and relatively mild parts of the UK (-5 to 1)
H4: hardy through most of the UK (-10 to -5)
H5: hardy in most places throughout the UK even in severe winters (-15 to -10)
H6: hardy in all of UK and northern Europe (-20 to -15)
H7: hardy in the severest European continental climates (< -20)

Botanical details

Family: Orchidaceae
Native to GB / Ireland: No
Foliage: Evergreen
Habit: Clump forming, Columnar upright
Name status: Correct
Plant range: Central highlands of Madagascar

How to grow

Cultivation

Grow in an open, well drained but moisture-retentive mix which can include, lava rock or pumice, fine fir bark and leafmold or chopped sphagnum moss. Provide the brightest light possible without risking scorching the plant’s leaves. Prefers a minimum night temperature of 12°C and a maximum of 25°C in the daytime. Night time temperatures should be 10°C lower than daytime temperatures for good growth and is beneficial to induce flowering. High humidity is required along with good air movement. Allow plants to freely drain when watering and avoid plants sitting in water as this can cause roots to rot. Plants may be intolerant of hard tap water, so irrigate with rainwater at room temperature. Orchid fertiliser can be applied regularly throughout the growing season, March to September. Reduce watering and feeding in winter months. See indoor orchid cultivation for further advice

Propagation

Propagation by seed is only possible in a controlled laboratory environment. Mature plants that have produced multiple stems may be divided when the plant overgrows its container. . Use a sterilized blade and ensure divisions have their own roots

Suggested planting locations and garden types

Conservatory and greenhouse

Pruning

No pruning required apart from the removal of faded flowers

Pests

May be susceptible to mealybugs and scale insects infestations

Diseases

Generally disease-free

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