About
A large-sized, evergreen, tropical, semi-terrestrial, epiphytic orchid hybrid. As a typical example of monopodial orchid, the new growth appears from the central tip of a long, slender, scrambling, stem-like rhizome. Terete leaves are attached at base to a green, alternate sheaths, covering the rhizome. As new leaves from at the top, older, lower leaves gradually drop off. Long, adventurous roots, attaching to anything in their surroundings emerge directly frm the stem, following the ascending growing trend. The plant flowers in spring or early summer on 15 - 30cm long, erect racemes, carrying approximately 6 large, long-lasting, scented flowers. Each flowers is 5 - 6cm large, with prominent, wide lip. Cultivar 'John Lacock' is almost pure white, with yellowish centre at the back of the lip.
About the genus
A medium to large-sized, evergreen, tropical epiphytic orchid, valued for its large, bright-coloured, long-lasting flowers, often used by florists. As a typical example of a monopodial orchid, the new growth emerges from a central tip on a long, central rhizome, while older, lower leaves gradually drop off. Strap-shaped, green or dark-green leaves, up to 60 cm long angle out from the main stem. A characteristic feature of the plant is an impressive root system that hangs downwards at the base of the plant. New roots emerge from the central stem, following the ascending growing trend. Inflorescences emerge from axils of leaves and main stem, and carry up to 8 large, waxy, round-shaped flowers.
Growing conditions
SunlightFull sun, Partial shade
Soil pHNeutral
Soil moistureMoist but well-drained
AspectEast-facing, South-facing, West-facing
ExposureSheltered
UK hardinessH1A
Plant details
Plant typeConservatory Greenhouse
HabitColumnar upright, Climbing
FoliageEvergreen
Height1-1.5 metres
Spread0.5-1 metres
Time to full height5-10 years
Suggested usesContainers, conservatories, houseplants.
FragranceFlower
Care notes
CultivationFor successful cultivation and frequent flowering, plants require high light levels and long, light days. In summer, they would benefit from being in a warm and bright greenhouse or conservatory, but direct, mid-day sun should be avoided. Highly absorbent, sponge-like roots are the principal water-storage organs. Dark green or purplish tips of the roots may be observed as a sign of actively growing plant. They are heavy feeders and require regular application of orchid fertiliser between spring and autumn. High air humidity (70 -80%), good air circulation and regular misiting should be provided frequently when in active growth. In cooler climates with shorter days, plants may go dormant in winter. Misting may be reduced to avoid rots, but plants shouldn't be left dry for long periods. Ideal temperature range is 15°C in winter and up to 30°C during summer months. Plants can be grown in an open baskets, or in a coarse, bark-based epiphyte orchid mix.
PruningRemove spent flower stems at the base. Old, ''leggy'' plants with bare stems can be cut during their active growing season to reduce the size of the plant. Cut through the rhizome, below the new developed set of aerial roots. Lowering apical dominance by laying plant horizontally, or hanging upside down will support the growth of new roots.
PropagationPropagation by seed is only possible in a controlled laboratory environment. Mature plants produce sideshoots (keiki) which may be removed and potted separately, when the new roots (preferably 3 or more) are at least 2cm long.
Pest resistanceMay be susceptible to scale insects and mealybugs. Thrips can cause damage on flowers and developing flower buds.
Disease resistanceGenerally disease-free. Poor air movement may cause bacterial of fungal rots. Good hygiene practice and sterilising cutting tools prevent the spread of virus diseases.