Charlie has more or less summed it up, so not much for me to add
except that it is important not to try and tear away dead leaves from
the base. Just cut them neatly otherwise rot can enter at stem level
and quickly travel through the rootstock with fatal results. At this
time of year, it is best to keep your plant virtually dry. Bananas
can't be over-watered when growing strongly in summer and conversely,
they can't be under-watered when being kept cool or cold in winter.