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Posted on 11:28 PM by Wanto and filed under
By Hans Reinhard
The warm-growing orchids include the popular phalaenopsis, and ideally they should be grown at a minimum winter night temperature of 18C (64F), with a summer day maximum of 32C (90F). However, in indoor conditions, where the atmosphere is naturally drier than in a greenhouse, they seem to do well at temperatures that are closer to those of the intermediate orchids. If you are growing your orchids indoors, you can usually find various positions around the home to suit these different temperature-range plants.
In more severe cases, direct sun will burn the leaves, causing black areas where the sun's rays have destroyed the leaf cells.
Insufficient light, on the other hand, will create dark green leaves that can become over-extended and limp. The aim should be to give your orchids just enough light to produce a good mid-green, healthy foliage and pseudo bulbs that will develop flower spikes at the right time.
The minimum temperature is that experienced on winter nights, and indoors some form of artificial heating will be required to maintain that. A drop of a few degrees is not going to cause any harm, but if the winter night temperature is consistently lower by more than 3C (5F), the plants will suffer. Also, in colder temperatures other problems can arise, such as molds and damp spots on the orchids.
Orchids grown indoors have less light available, and the orchids will only receive this from one direction, so the dangers of giving too much light is not so great a problem. During the winter, it can be a disadvantage if plants are not getting enough light, and it can be difficult to increase this through the window area.
Daytime temperatures should always be significantly higher than those at night, and in winter there should be a rise in temperature of at least 6C (10F). Where temperatures hardly rise during the daytime, humidity naturally rises, and an imbalance occurs that will result in rots and molds. Orchids dislike being cold and wet, but they also cannot tolerate the other extreme of being hot and dry.
In a greenhouse or heated conservatory, it becomes easier to contra:, light levels, and in the winter the orchids will benefit from full light with no risk of burning from the sun s weak rays.
Orchids can be fed at all ages, from young seedlings and propagations to adult plants. Feed only healthy plants, however, because they have the ability to absorb and convert the chemicals. Do feed plants that are sick or have lost their roots. New roots that appear may be burnt by the residue remaining in the compost (growing medium). For the same reason, do not feed orchids that are resting. Their roots will have become inactive, and the chemicals will remain in the compost where they may cause harm as the plant sans into growth in the spring.
In more severe cases, direct sun will burn the leaves, causing black areas where the sun's rays have destroyed the leaf cells.
Insufficient light, on the other hand, will create dark green leaves that can become over-extended and limp. The aim should be to give your orchids just enough light to produce a good mid-green, healthy foliage and pseudo bulbs that will develop flower spikes at the right time.
The minimum temperature is that experienced on winter nights, and indoors some form of artificial heating will be required to maintain that. A drop of a few degrees is not going to cause any harm, but if the winter night temperature is consistently lower by more than 3C (5F), the plants will suffer. Also, in colder temperatures other problems can arise, such as molds and damp spots on the orchids.
Orchids grown indoors have less light available, and the orchids will only receive this from one direction, so the dangers of giving too much light is not so great a problem. During the winter, it can be a disadvantage if plants are not getting enough light, and it can be difficult to increase this through the window area.
Daytime temperatures should always be significantly higher than those at night, and in winter there should be a rise in temperature of at least 6C (10F). Where temperatures hardly rise during the daytime, humidity naturally rises, and an imbalance occurs that will result in rots and molds. Orchids dislike being cold and wet, but they also cannot tolerate the other extreme of being hot and dry.
In a greenhouse or heated conservatory, it becomes easier to contra:, light levels, and in the winter the orchids will benefit from full light with no risk of burning from the sun s weak rays.
Orchids can be fed at all ages, from young seedlings and propagations to adult plants. Feed only healthy plants, however, because they have the ability to absorb and convert the chemicals. Do feed plants that are sick or have lost their roots. New roots that appear may be burnt by the residue remaining in the compost (growing medium). For the same reason, do not feed orchids that are resting. Their roots will have become inactive, and the chemicals will remain in the compost where they may cause harm as the plant sans into growth in the spring.
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