Dendrobium striclandianum - yellow leaves
 

Dendrobium striclandianum I have a little more than a year.At first it did well. But last 3-4 months it looks poor, unhealthy.
Two canes dropped all leaves, rest of them hold leaves wilted and pale; without turgor and sheen.
Roots look good.
There are 3 new growths.

Any recommendation would be very appreciated.

Growing conditions:
E facing window
humidity ~45-50%
temp Daytime 65-70 F
Night 60-64 F
~12h artificial lights

I don't grow this specific species, but I have grown other species that belong to the same section and come from roughly similar regions as it.

First of all let's get the name correct so you have a better chance of finding the correct information on this plant.

The correct spelling is:

Den. stricklandianum

It is apparently a synonym of:

Den. catenatum

This species of Dendrobium is in the section Dendrobium.

It is a semi-deciduous species from what I've seen in a photo of the plant.

In other words, the leaves on your plant may be dropping naturally, especially if the leaves are from the older canes.

It is one of those Dendrobium species that has a winter dormancy.

In the future, it would also be of great help to see a photo of your plant. :)

Thanks.
I knew it was semi-deciduous, but to my understanding it has WINTER dormancy, but this is happening now.
The problem is, I don't like the way leaves are yellowing. Maybe its better seen on pics.

You can try to grow the plant with warmer day temperatures that go up into the 80's F during the spring.

If that still makes the leaves turn yellow, then it may just be naturally doing what it's supposed to be doing. Particularly if the roots are undamaged.

You also haven't mentioned how often you water. Maybe that could be the issue, idk.

Looks fine to me, actually pretty healthy... :) Species in this section can drop leaves at any time, not just in the fall and winter, though that's when they're more likely to do so. I wouldn't worry about it unless the canes get soft or otherwise look unhealthy.

I agree with Philip that it could be a temperature thing, in my experience cooler spells often trigger leaf drop. This time of year and with the kind of robust new growth you're seeing, you should grow it on the warm side with copious water and fertilizer. I hope it continues doing well for you!

--Nat

wow! thanks! you guys just gave me the right idea! yesss!

yes, it's temperature! this year spring doesn't come and its pretty cold during nights, which affects temps in my growing room. well, I cann't change that. But what to do when real spring comes? I was planning to put my plants outside, in garden. Do you thing thats a good idea? Or it may get confused?

I don't think it'll be confused, but you gotta watch the temperatures and light exposure levels carefully.

I can do lights, but there is no way with temperatures.
Thank you once more!