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Temat: |
Re: Coryanthes. |
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Autor: |
Jerzy Dziedzic |
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E-mail: |
jerzy.dziedzic@orchidarium.pl |
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Data: |
piątek, 14 lutego 2003 19:26:09 |
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Coryanthes macrantha is native to the Amazon Basin including Brazil, Peru, Venezuela and the Guianas. Sometimes called the 'bucket orchid', as the complex lip structure contains a reservoir of nectar to attract pollinators. It is related to Stanhopea. This plant is found growing in association with ants that provide protection and produce formic acid around the root structure.
Light
Medium light, from 15000-30000 lux for mature plants. This plant will do well in east windows of the home or under lights. When light levels are high try to increase humidity and keep moist at the roots to prevent burning.
Temperature
This is a warm growing plant requiring night temperatures no colder than 60 degrees to do best. Day temps can range from the mid-70's to low 90's.
Humidity
50% or higher. Good humidity is essential as this plant has thin leaves that can develop spider mites. Humidity and misting the leaves in the morning will help keep the spider mite population under control.
Water
This plant prefers rain, distilled, or reverse osmosis water, or water with low mineral content. During the growing season of spring through fall, water copiously allowing the plant to just approach dryness between watering. During the late fall and winter months, keep the plant somewhat drier at the roots. Resume normal watering when new growth appears.
Fertilizer
In nature this plant's association with ants creates an acidic condition around the roots. It is not uncommon for the pH to run in the range of 3.5. Very acidic indeed! To simulate these conditions use a fertilizer that contains phosphoric acid to drop the pH. We recommend GrowMore 20-10-20, or MirAcid 30-10-10. Another method is to add a small amount of vinegar to the water. Fertilize at the rate of ¼ teaspoon per gallon every watering with a clear flush once a month. During the winter months fertilize every third watering.
Flowering
This plant produces flower spikes from the base of the pseudobulbs, arching out and hanging down over the pot. If grown in a basket, they may produce spikes that will grow down through the basket. The flowers are always produced in clusters of two. They are large, approximately 5" in size. Colors are greenish yellow overlaid with mahogany spots. The lip is heavily colored in reddish mahogany. The flowers last approximately one week. Insects enter the lip through the large mouth at the top, drink the nectar, and force their way out a small opening in the lip that contains the pollen. This sticks to their heads, and the next flower they visit gets pollinated. They are extremely fragrant.
Repotting
This plant should only be grown in New Zealand sphagnum moss. The moss has a natural acidic quality and moisture retentiveness necessary for the growth of this plant. It is best to repot every 18-24 months when new growths emerge but not while flowering. Plastic pots or teak baskets are best.
Jerzy
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