I already did a couple of searches but couldn't find the answer I was looking for.
If the top leaf (not full grown) of a Phal should slowly start to turn yellow starting from the base, what could be some causes for this? I know about older leaves falling off & to check the underside of the leaf. I read a lack of nitrogen could cause leaves to turn yellow but I'm not sure if I've ever seen that mentioned on the forum.
Also is there a way to search for posts that contain a set of specific words? Ex: if I wanted to only see post that contain yellow, leaf & top. I've typed in multiple words before & will get threads that contain those through out but have nothing to do with what I'm looking for.