Dwarf Cavendish help please
 

Hi, I own a dwarf cavendish, well several. It was originally 1 plant I purchased in 2016 or 2017 about 5 ft tall from a local nursery. It had several pups and I've split them apart over the years. I live in zone 6b so the plants live inside during the winter and outside during late spring, summer, and early autumn. They have a wonderful amount of healthy growth during this time. Producing many luscious green leaves, tall thick p-stems, and more pups. They have never fruited though. The largest p-stems maintain steady during the winter but usually round February there starts to some kind of change where they just die. The leaves yellow and fall off one by one and then the p-stem collapses. The pups within the same pot are unaffected.

It is now warm enough for them to go outside, while I was moving them down the deck stairs (it's like 2 steps) using the handtruck, the p-stems off two in the same pot snapped off (Pot A)! This is a first.

I've posted pictures to an imgur album with explanations.
https://imgur.com/a/zvU2B9e
Any help would be appreciated getting them to stay healthy.

I will note that during the winter they have priority seating at the windows. I grow [a lot] of potted citrus so those get secondary seating. The pups from last year got their own smaller pots while the older ones live in the 25 gal ones.

Their potting medium is 75% mini pine bark nuggets and 25% Miracle Gro Moisture Control soil. They get fed Miracle Gro All-Purpose water soluble food during their time outdoors but never indoors, only watered. The roots usually grow a lot and even try to make their way out the drainage holes of the pot.

Re: Dwarf Cavendish help please
 

Bananas are pretty heavy feeders. If you're using a general fertilizer it might not be enough.

What are the numbers on the fertilizer you're using? On the banana fertilizer I have, it says 15*5*30.

Re: Dwarf Cavendish help please
 

Mine is 24-8-16. And around July it gets hit with some 15-30-15 (same at the tomato plants since it's annoying to change the cartridge). Otherwise the miracle gro all-purpose is given every 2 weeks when outside since their potted and nitrogen easily washes out during watering. It also has some Osmocote pellets 18-6-12 that's slated for 8-9 month slow release.
I give it foliar applications of calcium only when the tomatoes display the deficiency since they easily show it.

Re: Dwarf Cavendish help please
 

Perhaps one of the experts will chime in, but the K number seems low in all of those. Check this post for a bit more detail.

http://www.bananas.org/f312/fertiliz...tity-8522.html