Hi everyone :)
My philoendron Brasil isn't doing so well... a couple of months ago the leaves started taking on a 'matted' appearance, getting orange blotches, gradually losing colour and falling off, leading to 'balding'. The problem mainly affects older leaves near the soil, but a few younger ones have also fallen off like that. Adding to my misery, newest leaves on the plain green philodendron that sits next to the Brasil are matted (presumably early stages of yellowing)!
I changed flats a month ago, so the Brasil was moved from a northern window to 9 feet away from a western window, and is now in lower humidity (~45) and higher temperatures (22-26 C) than before. I don't fertilize my plants that often and mix my own soil (coco coir, perlite and worm castings).
I'm wondering if anyone recognizes this pattern of leaf matting/yellowing and could point me in the right direction. Is this plain old overwatering, or some nutrient deficiency? I checked the roots today, and the soil was very moist (I did water it a few days ago) with some roots circling the bottom of the pot but nothing tragic. Roots were brown in colour, but not squishy.