Bamboo will not be happy for a long time in pure compost. It needs some
minerals which are found in sand and most kinds of soil. So you should
mix some sand or garden soil with the compost. You can also buy special
bamboo food with the necessary minerals if you want to grow in a sterile
medium, but some sand or soil is much cheaper.
Yes, bamboo does shed its leaves in the spring prior to replacing the
leaves, if the leaves survived the winter. But be careful, browning
could also be waterlogging or drought.
Bamboo needs a lot of water so you will have to water regularly growing
in containers. Not all kinds are happy for long in containers unless
they are huge. The less happy kinds you may have to split the plant
from time to time when repotting it once it fills the container, a job
which can require machine tools.
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echinosum