Please help. The oldest leaf on my terunos keeps turning yellow and dying, and now it is showing up on random leaves as well. These are not old enough to be dying. Here is what I know:
Not pest related, I have sat with my magnifier for hours to look. My other plants are not showing anything similar.
I use a very chunky soil – cactus soil, perlite, bark
They are all in greenhouses, 1 is in a humidity regulated greenhouse with airflow, the other 2 are in a small ikea greenhouse with humidity trays.
They are under growlights.
I use thrive about once a month. Happens whether or not I use that.
The only thing that I can think of is that they don't like hard water. Are they diseased? Do they not like humidity? What am I doing wrong?
Pic 1: linda
Pic 2: robin
Pic 3: amazon
Pic 4: can't remember
by theyolan