Why is your dwarf banana tree turning brown?
Possible causes include insufficient watering, fungal infection or cold weather.
Give them full sun and lots of water. The tops of the plants may die down in cold weather, but new growth will begin in the spring. They are very fast growing and need frequent, deep watering during the growing season (spring - summer). Because the leaves are sensitive to cold weather, it might be that your plant is showing stress from winter weather, or from wind, which tends to dry the foliage out. Cut brown leaves off and keep the plant well watered and wait for new growth in the spring. The shoots are probably new stems produced by the roots of the plants. Cut away the old, dead portion of the plant and allow the new shoots to grow into a new tree.