Q.My treasured bamboo
Why is my container bamboo beginning to look like it is turning to burnt grass.please help!!! for sentimental reasons.

Are you giving your potted bamboo enough water? Remember that potted plants dry out quickly and therefore need to be watered more frequently than bamboo planted in the ground. Also, are you adding fertilizer? Container-grown bamboo need regular applications of a time-release high-nitrogen fertilizer to help them grow healthily.
https://www.gardeningknowhow.com/ornamental/foliage/bamboo/growing-bamboo-in-pots.htm
https://www.gardeningknowhow.com/ornamental/foliage/bamboo/bamboo-with-brown-tips.htm