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Originally Posted by silanah77
I don't know why has this happen-I thought when in full growth catasetums can't be overwatered...or? Also another thing-I saw a couple of days ago spider net arround the base, so I treated the orchids...I don't know if this can cause root rot. So what can I do? Obviously I make only mistakes...
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It probably depends on how the orchid is grown. If the roots are adapted to growing with lots of water around them, then maybe ok. Maybe.
But if the roots haven't adapted, or they simply can't the amount of water (assuming relatively low oxygen water) - then they can certainly run into issues with leaves yellowing/dying.
I encountered that once. Just once. I noticed leaves yellowing a bit - and checked the roots. The sphagnum was too wet. Unpotted the orchid (in order to notice the situation). I spread the sphagnum out a bit along with the roots to dry off for a while ...... then just packed the whole lot (roots and existing sphagnum together) back into a slightly larger pot ---- with scoria that surrounds the sphagnum mass ---- just to provide more aeration around the sides. It's probably unnecessary - but I did it anyway.
The yellowing leaves actually changed back to green with a day or so. That was great actually.
So - yes - depending on conditions and the orchid ----- it is certainly possible to 'overwater' a catasetum type orchid. The main thing is the definition of over-water. It will relate to the amount of water surrounding the roots or on the roots (and the surroudning media) -- and the state of the roots, media and the water. Oxygen content. And whether the roots are adapted to very watery conditions or not. And sometimes need to factor in the temperature - such as low temperatures.
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