my dark green phals are getting light green edges

[cgregory]

here in the last fer days a couple of my phals are getting light green edges and I can't figure it out I think they all seem to be happy so It must be something I'm doing could some help me out here. Thanks alot

[NYCorchidman]

This happened to one of my large white phal.
I had it for a number of years and the leaves were green all throughout, but last year, some of the leaves developed this yellowish line along the edge of them.
I posted a question and no one really knew what it was.

I'm interested to see anyone knows what this is, other than guesses.

[Ryan Young]

Looks to be sporting semi variegated to me.

Some plants have variegation as a defense mimicking poor health, and gets attacked less. No idea if this is the cause with this plant.

[Joseia]

I'm definitely no expert, but I think it might be due to light levels. My phals respond to stronger light by developing that light edge. If I lower the light levels, the light edge darkens up again with time.

[Leafmite]

It looks rather pretty.

[NYCorchidman]

Hmmm interesting because the one I had that developed this white edge, was the one that received the lowest light.

All others were much closer to the window and none of them exhibited this.

[Ray]

Let me throw this out for consideration - it is NOT a statement of fact or expression of first-hand knowledge:

The plant looks like it is being grown more dryly than it probably prefers, and I suspect the %RH is reduced this time of year. Together, it could be that the plant is desiccating to a minor degree, and that is appearing as yellowing of the leaf edges - the part of the plant that had the least "meat" behind it, to keep it well-supplied.

[mooburr]

I agree with Ray. I have a mini phal that had taken some abuse and responded very similarly, my fault of course. Here's a pic of the edge oldest leaf. I've corrected the conditions and the newer leaves are normal.

[Orchids4ever]

We have been discussing it last year- mine had the same Problem-after reading up on it a bit- it seems to be a Magnesium deficiency-so i add extra Magnesium now and the Leafs are better.

[cgregory]

I think there very happy my humid. stays between 65 and 75 they are all watered 2x wk with reg. seaweed and magnesium and I keep my light around 1200fc so if someone thinks I'm doing something wrong please let me know because I dont have a clue whats up thinks agine