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Conservatory Greenhouse

Dendrobium longicornu

A small-sized, epiphytic orchid with 30cm long, cane-like stems. The stems (pseudobulbs) are covered with thin, green, leaf-bearing sheath covered densely with short black hair. They are arranged alternately along the nodes on the stems, carrying semi-deciduous, lance-shaped leaves up to 7cm long and 1.4cm wide. Short flowering stems carry one to three, long-lasting, fragrant flowers. Each flower is 3-4cm across, white with yellow or orange veined lip.

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Ultimate height

0.1–0.5 metres

Time to ultimate height

5–10 years

Ultimate spread

0.1–0.5 metres

Moisture

Well–drained

pH

Neutral

	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Full sun
Partial shade

Aspect

East–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)

H1C

Botanical details

Family: Orchidaceae
Native to GB / Ireland: No
Foliage: Deciduous or Semi evergreen
Habit: Clump forming, Columnar upright, Tufted
Genus: Dendrobium are epiphytic and terrestrial orchids with elongated, stem-like pseudobulbs bearing linear to ovate leaves. Racemes or panicles of showy flowers are produced from nodes along the stems mainly in spring
Name status: Unresolved
Plant range: Himalayas to Myanmar, China, Vietnam

How to grow

Cultivation

Grow potted in an epiphytic, medium grade, bark-based potting mix with added perlite, moss, or coir. As with many orchids, they grow best when the roots are slightly restricted. Therefore, avoid over-potting or frequent root disturbance. Provide bright light conditions throughout the year. The average temperatures in summer are 25-30°C during day and 16-20°C at night time. Minimum growing temperatures in winter are 10-13°C. Plant requires frequent watering and relatively high humidity during spring and summer months and a slightly drier conditions in winter - reduce watering and feeding in October, but do not leave plant dry for long period of time. See indoor orchid cultivation

Propagation

Propagation by seed is only possible in controlled laboratory environment. Mature plants may be divided when the plant overgrows the pot. Sideshoots (keiki) may develop on older canes - remove and pot them into sphagnum moss when the new roots are at least 2cm long.

Suggested planting locations and garden types

Houseplants
Conservatory and greenhouse

Pruning

No pruning required. Remove spent flowers as necessary, but do not cut the whole cane unless completely shrivelled. Oldest canes may be removed as long as there are enough, younger, thick, leaf-bearing canes on the plant.

Pests

May be susceptible to scale insects, aphids, mealybugs and red spider mite.

Diseases

Generally disease-free.

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