http://imgur.com/gallery/MSl11fU
I got this last year for christmas. It is a dwarf, but I don't know the exact species. It has purple on the young leaves, which I remember was a good identifier. I brought it in at the beginning of October with my other nonhardy plants. It has always had browned leaf edges, presumably from wind, but recently (last 3 weeks) the older leaves have started to yellow. Before, the old leaves would simply brown and shrivel one at a time. Know a large number are yellowing.
Considering it was fine through 5 months of winter last year, I am assuming the issue is a change I made since last year. There are only a few things I can think of:
- It is no longer under the lights because it got too tall. I put it near the lights and the window, and I have a supplementary light targeting just it.
- Last winter I didn't fertilize as the natural fertilizer really smells. I did when outside for the summer though. This winter, I have recently started using a liquid chemical fertilizer I made from potassium nitrate and potassium phosphate. I dilute it according to instructions for premade liquid chemical fertilizers, so the concentration should be right. All the other plants get this too.
I would doubt the fertilizer is a problem; it would have to be way overdosed. And as shown, the other plants are loving it. Everybody gets watered the same.
I think the lighting is thr culprit, or perhaps something with the positioning. The previously super healthy philidendron up there has been suffering from a similar problem.
The banana was repotted in May when it came outside. I used 3 parts pine bark, 2 parts 1/8" gravel, 1 part diatomaceous earth, 1 part dried montmorillonite clay. I added roughly 1 part peat moss because I read they like a wetter soil, and the previous stuff alone usually dries pretty fast. I have used the base mix without peat for 2 years now on almost all my plants and bonsai and it works well.
What could be going on?