So, keep it in a place that receives enough sunlight. Over-watering is the easiest and fastest way to kill a string of bananas plant. Banana plants stop growing during the cooler months when temperatures stay below 50's so wont need much water. Banana plants have a generally irregular shape. Avoid using high nitrogen fertilizer, else you’ll get more vegetative growth than fruits. Don't take this to mean that you let the plant just dry out, it just means that between watering every couple of weeks and our normal winter rains your plant should survive just fine. Banana plant leaves are huge—depending on the variety, they can be up to 2 feet wide and 9 feet long. The soil should be fertile with pH levels between 5.5 to 7, and also well-drained. To grow a banana plant inside, first of all you will need a pot, large and deep enough to accommodate its roots. How to Grow a Banana Tree . Banana Pepper Plant Care Fertilizer. Grow this plant in a location where it will be sheltered from the wind as it is very susceptible to damaged leaves. In any case overwatering should be avoided as pepper plant is very sensitive to waterlogged soil and wet feet. Fertilize your growing banana pepper plant with organic vegetable fertilizer twice a month. Like outdoor banana plants, an indoor plant also requires bright sunlight for about 12 hours.