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This is a discussion on Need help: Orchid Leaves turning Yellow within the General Orchid Culture forums, part of the Orchid Culture category; I don`t think it is too much water as it looks very well drained charcoal ...
I don`t think it is too much water as it looks very well drained charcoal and dry ,as you say it is warm where you are .So you should be watering/feeding often ,when the charcoal becomes slightly dry then water .
It may have had too much light/sun ?
Does it have good roots ?if not this could well be the problem.
The shopkeeper would suggest you to mix 1 tea spoon of fertilizer to one liter of water, but any time milder is better, so mix half a tea spoon to one liter of water. Prepare atleast 5 liters of the solution and pour it very slowly all over the plant(even the leaves). Since our place is hot you will see within 15mins the solution on the leaves will disappear. After 2 days repeat the same process with just plain water, so that it will wash away all the salts deposited on the plant and the roots. I usually keep a bucket below the orchid pot to collect the solution that runs through the plant and the then use it for other plants, so that i do not waste the fertilizer also.
Thanks all for the wounderful support and tips....i have already started following the instructions. Now i will try to get some fertilizer and learn using.
My mum lives in Kenya so sort of same conditions as yours and she too mostly has her orchids potted in charcoal & sand. She keeps Phals, Paphs, cologenes outside under a porch.Where they get some light but not 'midday' sun. Others are under trees. Here are a couple photos I hope this helps. By the way they are also watered every few days in Winter & everyday 'in summer' which is now