I inherited this Dendrobium Phalaenopsis at the end of 2017 and it's more than 10 years old. It pretty much remained the same during that time and while under my care until May 2019 when I started getting serious about it's care.
After May it developed this huge new p.bulb (I think that's what they are called) but aborted it's spike. I asked about this here on the board and it was mentioned that the plant probably didn't have enough reserves to expend on it.
Dendrobium Spike stopped growing?
I don't know if this new issue is related because I can't pinpoint WHAT the issue may be. I read suggested articles and still can't figure it out.
Recently the plant's older leaves has started turning yellow pretty quickly and dropping off ( see picture ) and what confuses me is it's growing a new p.bulb which seems like it's going to be much larger than it's parent as it has a much thicker base than it's parent did.
So I'm a bit at a loss of what maybe the issue.
If this is at all possible I would say it seemed to tolerate being pretty neglected for years and it seems to be both thriving under more care and suffering as well.
Previously it was the skinny p.bulb which started having yellow leaves and dropping and I wasn't too concerned about that. I figured plants occasionally have yellow leaves . It never looked very healthy anyways. But now one of the larger ones that always looked pretty healthy has a yellow leaf so I'm concerned .
Any suggestions as to what I should do at this point?
Thank you
What I have observed or checked:
The medium looks good , It was new as of 2018 so I know it may need to be changed out soon but I was going to wait until after the new growth is finished. It doesn't look broken down from what I can tell.
It has a lot of new , large roots but I haven't dug it up to check it's older roots. Maybe I should?
Growing Conditions:
It has a lot more light than it use to. I have it in an East Window and I have grow lights.
I water it more frequently than it use to be but I try and make sure that the pot is dried out before I soak it. I have a bamboo skewer stuck into it's pot and water when the skewer is dry fully dry.
It is given repotme MSU fertilizer once a month and normal water the other times. I recently switched to RO water.
Room is pretty high in humidity I think. Usually 50 - 55% . I have two humidifiers and it sits over a tray of water. It's more humidity than what it was above my kitchen sink for sure.
Dendrobium leaves turning yellow
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