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Conservatory Greenhouse

Dendrobium Ong-Ang Ai Boon gx

A large-sized, clump-forming, evergreen orchid with cane-like, noded stems up to 150cm long. The stems (pseudobulbs) are covered in thin, alternate, leaf-bearing sheaths. Oval-shaped, green or dark green, leathery leaves are 8-10cm long. Upright flowering stems up to 45cm long from the upper nodes of mature, leaf-bearing or leaf-less stems. Each raceme carries up to 20 long-lasting, 4-5cm large, yellow flowers with spirally twisted, upright petals.

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Ultimate height

1–1.5 metres

Time to ultimate height

5–10 years

Ultimate spread

0.5–1 metres

Moisture

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)

H1A

Botanical details

Family: Orchidaceae
Native to GB / Ireland: No
Foliage: Evergreen
Habit: Clump forming, Columnar upright
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: Accepted

How to grow

Cultivation

Grow 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 are 25-30°C during day and 16-20°C at night time, with an amplitude of 8-10°C between day and night. 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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