Cattleya bowringiana yellowing leaves and stem
 

My Cattleya bowringiana's leaves and stems are becoming very yellow, there are new growths that are slowly progressing but not sure reason for the yellowing cane/stem and leaves.

Please let me know your thoughts.

That looks like a combination of too much light and too little water. I think you've had a heat wave recently? Is this a recently repotted plant with a disturbed root system?

In addition I wouldn't pot it so deeply. The rhizome should be at the surface of the bark, not buried. People use one or more wire rhizome clips to fix them firmly after repotting, so they don't wobble. Once the plant is firmly rooted the clip can be removed, though that isn't necessary.

Thanks ES.

I bought it from a local nursery two months back and they told me that it's been recently reported, I received division, and it put those new growth so quickly but I am seeing stem and leaves yellowing from last week. I will try to repot after a couple of days once a little bit cool down.

The first photo shows an old (previously bloomed) pseudobulb. If the roots were disturbed (or not in good shape) that would be the first to go, as the plant draws energy from it. The second photo shows a growth that is newer, more concerning. Do wait until you see new roots before disturbing it again. you can remove some of the bark, to expose the rhizome, without disturbing roots. That will also give you a better idea of what is going on. Remember, a fresh division has also had some trauma, losing oldest (likely rootless) growths is fairly normal. Be concerned about the new growths... unburying those is important.

Thanks Roberta.

I removed some of the surface bark without disturbing roots, I saw good roots, but as you mentioned the roots attached to the same pbulb are rotted and even bark inside looks too old. Is this a good time to repot may be next week or so or should I wait ?

Thanks.

When you see NEW roots just emerging, that's the time to repot. How does the mix look under the new parts of the plant? That would be a clue. (The roots of the oldest growths die anyway) Catts in general resent being potted at the wrong time, bifoliate Catts even more so. If the bark under the new growth doesn't look good, just cut back on watering - even bad bark dries out, just more slowly.

Thanks Roberta.

I will check more carefully, but you are right when I checked the bark inside was looking more wet, I will cut back watering and let it dry and will see if I can remove more bark without disturbing roots.


Thank.