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This article will help with fertilizing Bananas:

https://www.gardeningknowhow.com/edible/fruits/banana/feeding-banana-plants.htm

Bananas are notorious for contracting many diseases. This will be hard to diagnose only seeing the damage on the stem, as the diseases will show themselves differently, depending on the species.

This article will help you to get started in diagnosing the issue at hand:

https://www.gardeningknowhow.com/edible/fruits/banana/banana-pests-and-diseases.htm

No. We do not sell anything. We only offer gardening information.

We don't make product recommendations, but this article should help you:

This article will help you.

https://www.gardeningknowhow.com/edible/fruits/banana/feeding-banana-plants.htm

They, definitely, prefer a little shade. When it starts clumping, you will notice that the inner plants do way better then those exposed to full sun. There is a caveat, though. Full sun is best for fruit production.

In nature, they will clump, which gives some shade to the inner plants, while allowing the clump as a whole to receive shade in the center.

Here is an article that will help you to care for banana plants in container:

https://www.gardeningknowhow.com/edible/fruits/banana/what-are-thai-bananas.htm

The banana that you eat on a daily basis is a genetic mutant and hybrid. Those are the remnants of connective tissue that connect the peel to the seeds. Since these are not present in the modern banana, they serve no function.

Here is a little trick, though. Peel the banana upside down, and most of those come off, since peeling upside down goes against the grain of growth of the connective tissue.

This article will offer information on bananas, as well as help you to germinate banana seeds, should you have an interest in the subject: https://www.gardeningknowhow.com/edible/fruits/banana/growing-bananas-from-seeds.htm