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Originally Posted by Chicago
As for If they are new or old..I’m not completely sure
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It's usually possible to observe the orchid to get some idea about which leaves look new or newest. If the bulbs associated with the newest leaves are turning yellow too, then that won't be a good sign.
Oldest bulbs eventually do become yellow, and dry up.
If any bulb goes yellow and brown/dark, and gets mushy, then that would indicate rotting activity. If you do notice such thing later, then the orchid should be removed from the existing potting media, so that the roots can be inspected, and the rotting region should be removed with a clean/sterilised cutting tool.
A systematic fungicide for orchids could then be applied. The cut regions should be given some time to dry and seal up, before finally repotting into clean media.
The main general recommendations for orchids of this sort grown using classical methods are : maintain natural air-flow (ie. avoid still-air environment); maintain comfortable temperature for the orchid; provide adequate duration and level of lighting for the orchid each day; maintain good air-flow around the roots and media inside the pot, which means good drainage pot and using a media that can retain moisture for some useful amount of time but won't become water-logged, and use a growing media that allows air to flow fairly easily through the pot; water adequately - as too little water can be problematic.
You're using course bark and perlite mix, which is absolutely fine. For this media, adjust your watering schedule appropriately to suit your orchids.
While once-a-week or twice-a-week might be ok for some growers in particular regions of the world, it might not be enough for other regions. It depends on just how quickly the media in the pot dries out in the place you're growing your orchids.
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