Wondering how you are making out with your yellowing leaves? I looked up some info. Similar to what other helpful posters have give you. Here it is just the same:
Quote:
Yellowing leaves could be from, too much light (most common), not enough nitrogen in the fertilizer or if the medium is primarily bark. Other causes include being subjected to low temps or loss of roots.
Caring for orchids would suggest to first change the lighting and potential for low temps. Keep in mind that in the North being on a window sill during winter can be a cold spot.
Another condition that you could see in orchids are small spots that turn from reddish brown to black. These are most likely caused by fungal infection.
As orchid growers we need to remember that humidity is needed for proper orchid growth and the orchid supply. Too much humidity favors the growth of fungus.
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Hope it helps you in some way. Best of luck.
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