Hello Knotz, It appears they have seen some container constraints and may have burned through the avail nutrients. Bananas are tough as nails and should regain steam as the summer temps start to rise. I would recommend that you add some sort of organic fertilizer to the container. bananas are heavy feeders as well as growers they only know one speed fast fast fast. good luck... Florida hill nursery

Geez, it just seems so odd to grow Bananas in pots.

Where I live (Caribbean island) we wouldn't dream of growing them in pots
but then we don't ever need to move them indoors when the weather cools.
Our coolest nights in late December are around 70 degrees Farenheit.

We just stick 'em in the ground and they grow!