I have had this bamboo plant for years... always watered it once a week and kept it by the window... it’s always been flourishing until now... how Can I save my dear friend!
Bamboo Plant Dying?
Certified GKH Gardening Expert
That container seems very small for such a large plant. I would recommend replanting, and cutting off an inch or two of the bottom of the root mass before replanting. This should solve your issue.
This article will give you more information on the care of bamboo: https://www.gardeningknowhow.com/ornamental/foliage/bamboo/growing-bamboo-in-pots.htm