Polystachya concreta is found in China, India, Sri Lanka, Nicobar, Thailand, Malaysia, Laos, Vietnam, Borneo, Java, Lesser Sunda Islands, Moluccas, the Philippines, Sulawesi, Sumatra, Florida, Mexico, Guatemala, Honduras, Panama, Bahamas, Cuba, Dominican Republic, Haiti, Cayman Islands, Jamaica, Leewards, Puerto Rico, Trinidad & Tobago, Windwards, Fr Guiana, Guyana, Surinam, Venezuela, Colombia, Ecuador, Peru, Bolivia, Brazil and Argentina.
Polystachya concreta also called as The greater yellowspike orchid, Pale Flowered Polystachya, Callista flavescens, Cranichis luteola, Dendrobium flavescens, Dendrobium parvum, Dendrobium polystachyon, Dendrobium polystachyum, Dendrorchis extinctoria, Dendrorchis minuta, Dendrorchis polystachyon, Dendrorchis purpurea, Dendrorchis wightii, Dendrorchis zollingeri, Epidendrum concretum, Epidendrum minutum, Maxillaria luteola, Maxillaria purpurea, Onychium flavescens, Polystachya caquetana, Polystachya colombiana, Polystachya cubensis, Polystachya dagremondiana, Polystachya extinctoria, Polystachya flavescens, Polystachya kraenzliniana, Polystachya luteola, Polystachya luteola, Polystachya luteola var. exsanguis, Polystachya luteola var. paniculata, Polystachya luteola var. racemifera, Polystachya luteola var. tincta, Polystachya minuta, Polystachya penangensis, Polystachya pleistantha, Polystachya purpurea, Polystachya purpurea var. lutescens, Polystachya reichenbachiana, Polystachya siamensis, Polystachya singapurensis, Polystachya tricuspidata, Polystachya wightii, Polystachya zeylanica, Polystachya zollingeri, is a species of the genus Polystachya. This species was described by Leslie Andrew Garay & Herman Royden Sweet in 1974.
IDENTIFY POLYSTACHYA CONCRETA ORCHID PLANT
Polystachya concreta is found in China, India, Sri Lanka, Nicobar, Thailand, Malaysia, Laos, Vietnam, Borneo, Java, Lesser Sunda Islands, Moluccas, the Philippines, Sulawesi, Sumatra, Florida, Mexico, Guatemala, Honduras, Panama, Bahamas, Cuba, Dominican Republic, Haiti, Cayman Islands, Jamaica, Leewards, Puerto Rico, Trinidad & Tobago, Windwards, Fr Guiana, Guyana, Surinam, Venezuela, Colombia, Ecuador, Peru, Bolivia, Brazil and Argentina. In most regions, plants grow in wet or moist lowland forests, but in warmer regions, plants have been found at elevations up to 1400 m. In Java, plants reportedly are common all over the island from 50 m to more than 1000 m.
The greater yellowspike orchid is a miniature to small sized, up to 60 cm tall, hot to warm growing epiphyte with ovoid, tapered pseudobulbs enveloped by a series of imbricate, scarious bracts with 2 to 4 oblanceolate, acute, up to 25 cm long, 1.3-5 cm wide leaves that is conduplicate to the tapered, sub-petiolate base.
Pale Flowered Polystachya flowers on an apical, 4 to 30 cm long, many flowered, paniculate inflorescence subtended by 2 to 3 large, compressed, ancipitous bracts arising on a mature pseudobulb with large, pale, scarious sheaths occuring in spring and summer. The flowers are fleshy, rather small, yellow, yellowish green or dull pink.
POLYSTACHYA CONCRETA ORCHID PLANT CARE AND CULTURE
Cultural information should only be used as a guide, and should be to be adapted to suit you. Your physical location; where you grow your plants, how much time you have to devote to their care, and many other factors, will need to be taken into account. Only then can you decide on the cultural methods that best suit you and your plants.
Light:
Polystachya concreta needs a light level of 25000-35000 lux. Light should be filtered or diffused, and plants should not be exposed to direct midday sun. Strong air movement should be provided at all times.
Temperature:
Summer temperature days in the Florida habitat is average 32-33°C, and nights average 21-22°C, with a diurnal range of 11°C. In the Java habitat, days are cooler, averaging 26°C, while the nights average 20°C, and the diurnal range is 6°C.
Humidity:
The greater yellowspike orchid need the humidity of 75-80% most of the year, dropping to near 70% for a couple of months in late winter or early spring before the heavy rains start.
Substrate, growing media and repotting:
Polystachya concreta may be grown in relatively small pots or baskets filled with an open, fast-draining medium that retains some moisture after watering. The medium should dry out between waterings, however. The standard fir-bark mixes work well for many growers.
Plants may also be mounted tightly to a tree-fern slab. If mounted, however, high humidity must be maintained and the plants watered at least once daily in summer. Several waterings a day may be necessary for mounted plants during extremely hot, dry weather.
These orchids appear to grow better when allowed to form large clumps, so they should be divided as little as possible. Repotting, mounting, or dividing should be done only when new root growth is just starting. This allows the plant to become established in the shortest possible time with the least amount of stress.
Watering:
Moderate to heavy most of the year, with a somewhat drier period in late winter and early spring. There is not an extended, excessively dry season, however. Cultivated plants should be watered often when actively growing, but drainage must be excellent, and conditions around the roots should never become stale or soggy.
Fertilizer:
1/4-1/2 recommended strength, applied weekly when plants are actively growing. You can use a balanced fertilizer throughout the year; but also can use a high-nitrogen fertilizer from spring to midsummer, then switch to one high in phosphates in late summer and autumn.
Rest period:
Winter days in the Florida is average 26°C, and nights average 12-13°C, with a diurnal range of 13-14°C. In the Java habitat, winter days average 27°C, nights average 19-20°C, and the diurnal range is 7-8°C. Water should be reduced somewhat for Polystachya concreta in winter, but they should not be allowed to dry out completely. Fertilizer should be reduced or eliminated until new growth starts and heavier watering is resumed.
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