Phal on S/H yellowing leaves!
 

Hi guys!

In a previous post I showed my beautiful NoId Phal ( http://www.orchidboard.com/community...-beginner.html ).
Everything was going great, lots of roots, strong green leaves, and even recently a strong spike emerged, with four ramifications so far, and what appear to be a second spike as well.

But now it is yellowing the leaves. They start to get dark red in the tips, and it then evolves to yellow, with something like "old skin" feel, and then the leave falls off. It happened to two leaves already, and *all* the leaves are getting red on the tips, so I guess they will all fall out :_( But the spike seems to be OK. I don't really understand what's the matter. I mean, the plant in on S/H, it should be with the right amount of water, not too much and not lacking it either.

Can anyone help me? This phal is very special to me! Thanks!

Are your roots still healthy and growing?
Have you changed the postion of the plant lately?
Joann

Thta's strange! Are sure that the red tips are directly linked to the yellowing? The red could be something unrelated and the plant just happened to shed to old leaves at the same time.

Have you changed anything in the way you grow it? (light, temper, position) and do you properly flush out the pot each time you water?

Yeah, that certainly doesn't sound like anything related to S/H culture itself, more likely some other change - in chemistry, maybe?

OK, so I took some pictures (with cell phone, sorry), to show better what's going on.

https://lh6.googleusercontent.com/-N...3-18-44-39.jpg
https://lh3.googleusercontent.com/-k...3-18-43-56.jpg
https://lh3.googleusercontent.com/-R...3-18-42-58.jpg

I changed nothing about the way it was before. It's the same water, the same fertilizer in a weak solution, same sunny spot. Only the seasons changed, LOL. Perhaps I'm over reacting and the plant is just shedding some leaves, but I don't really like that the other leaves are becoming red in the tips...

season change: is it warmer and brighter near the glass? I notice that only the leaves near the glass is damaged...the oposite side is not
is it getting direct sun by 11am to 3pm?
the roots and spike are fine...

I agree with Bud Looks like it is getting too much sunshine. You need to move it back from the window and an idea might be to hang a nylon/net curtain on the window.

Let me throw something out that way out of "right field" - Maybe (and I stress "maybe") this is the plant's reaction to having a steady water supply and brighter light.

The appearance of the waning leaves does not look so out-of-the-ordinary for normal leaf senescence, other than it not being only the bottom-most ones. The plant, otherwise, looks pretty healthy.

Leaves are "photoreceptor panels" and "water storage tanks", so if the water supply is more steady, and the light level is higher, it doesn't need as many.

NB: This could be total BS, but it's something to at least consider.