moth orchid losing its leaves

tamij(7)April 11, 2010

newbie here. my leaves are falling off all but 2 so far. this orchid has been fabulous. i inherited it and now the flowers are fading and leaves are yellow and falling. I think I may have it in too much water? I would love to keep the plant and have been told once it blooms it is over and done with?? i hope not. any advice? Thanks, tamij

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arthurm(Sydney, NSW AUST)

There is a wealth of information on the net and complete culture notes that are way outside my typing speed.

Find some complete culture notes on the net that relate to a climate similar to NC.

Look up past posts on Phalaenopsis culture on this site. To find them just put Phalaenopsis in the search box on top of the discussions page.

At the foot of this post are some notes written for Sydney, Australia.

Still puzzled after all that? Come back here with more questions.
Phalaenopsis Culture

These notes relate to Phalaenopsis culture in the Sydney area. These orchids cannot be grown outside in the yard or in a shade-house because winter minimum temperatures are too low and some summer maximum temperatures are too high. These temperature problems plus low humidity mean that special housing to meet Phalaenopsis needs is required, or the plants should be grown inside your home.

Culture within the home
Finding the place to put the plant. Your plant needs bright light, humidity levels of about 60% and temperatures where both you and the plant will be comfortable. That rules out one place that is often suggested, the bathroom. Another place that is a not good is one of those small closed in sunrooms where dry winter air is heated and the humidity levels are too low.
My plants are on the windowsill of a large airy kitchen. Winter temperatures range from 12C to 18C each day and a fibreglass blind protects the plants from all but a few hours of gentle sun in winter. Do not expose the plant to harsh direct sunlight because the leaves of the plant will burn. Early morning sun is best, but late afternoon sun is also OK provided it is screened as described above.

Humidity
Some people recommend spraying the plants with water every day to raise humidity. This is not necessary because the humidity level in most homes is about 60%. You may wish to place the plant on a humidity tray containing pebbles and water. This is not necessary either, but will not cause harm, provided the bottom of the pot is not sitting in water.

Watering
Frequency depends on the potting material and the atmosphere in the house but as a general guide once a week in winter grading to two or three times a week in summer. Potting material should be kept moist but not sopping wet.
Fertilizing
Use complete liquid fertilizer with every third watering, but only at half the prescribed strength. Wet the foliage as well.
Repotting
Every two years in late spring. Use specially prepared orchid bark, not Cymbidium mix. Try not to disturb the roots too much and just replace some of the older bark. Do not be in hurry to put in plant in a larger pot, because like most orchids, the plants seem to do better in a slightly pot-bound condition. Do not worry about some roots growing outside the pot. That is a good sign.

Treatment of flowering stem
When the flowers are nearly finished, you can cut the stem off just below the lowest flower and the plant may produce a new flowering shoot from the node just below the cut. BUT, note that most experienced growers cut the stem off at the base so the plant will put all its energy into growing new leaves, and therefore will produce better flowers next time.

Making the plant flower
The plant should produce a new flowering stem in late autumn as the temperatures drop. Some growers induce flowering by watering the plant with Epsom salts (Magnesium Sulfate) once a week several times in autumn. The amount of Epsom salts required is one tablespoon full in a bucket of water.
Pests and diseases
Your plant should remain pest and disease free in the home environment. Fungal disease which shows up as black spots on the leaves is a symptom of over-watering, cut back on the watering a bit and seek help from a nursery or garden centre if the problem persists.

    Bookmark   April 11, 2010 at 8:07PM
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