Posted: 09/04/2014 at 16:11
Bamboo should like wet and mild, mine put on new growth in winter, sending out shoots. They do naturally lose leaves now. I am wondering if air circulation is too poor in your car port, causing mould? So I would leave the leaves and stalks and let the wind and nature take its course.
Pruning wise, I only thin out stalks but some people do cut Bamboo when they have reached their desired height - it is up to you if you think 4ft is the right height. Those pruned stalks do not grow taller, only new ones will.