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Conservatory Greenhouse

Dendrobium densiflorum

pineapple orchid

A medium-sized, evergreen, epiphytic orchid with cane-like, fleshy, green upright pseudobulbs up to 60cm long. Four to six dark green, leathery, glossy leaves are arranged along the upper nodes and near the top of each pseudobulb. Each lance-shaped leaf is 10-15cm long and 6-7cm wide. Pendant, densely-flowered racemes emerge from the axils of leaves in winter and spring. Short-lived flowers are bright yellow, 5cm large with rounded lip with darker yellow-orange centre.

Size
Ultimate height
0.5–1 metres
Time to ultimate height
5–10 years
Ultimate spread
0.5–1 metres
Growing conditions
Moisture
Well–drained
pH
Neutral
Colour & scent
StemFlowerFoliageFruit
Spring Green Grey Silver Yellow Orange Green
Summer Green Grey Silver Green
Autumn Green Grey Silver Green
Winter Green Grey Silver Yellow Orange Green
Position
  • Partial shade
  • Full sun
Aspect

East–facing or South–facing or West–facing

Exposure
Sheltered
Hardiness
H1A
Botanical details
Family
Orchidaceae
Native to the UK
No
Foliage
Evergreen or Semi 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

Correct

Plant range
Assam, Himalaya, SE Asia and Indochina

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How to grow

Cultivation

Plants are best grown in a pot 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. It is a cool to warm-growing orchid with average temperatures between 16-25°C. It can be grown similarly to Moth Orchid (Phalaenopsis) but requires much brighter conditions. Provide indirect light and higher humidity by misting regularly in spring and summer, then move the plant to a bright, room in autumn and winter. Reduce watering and feeding until warmer temperatures initiate new growth in spring. 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
  • 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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