Is bamboo a common noun

Yes, the noun bamboo is a common noun, a Word for any bamboo anywhere.

A proper noun is the name of a person, place, thing, or a title; for example:

• American Bamboo Society, Encinitas, CA
• Bamboo Street, Hialeah, FL
• Bamboo Road, New Orleans, LA
• Bamboo Cafe, Myrtle Beach, SC
• 'House of Bamboo' movie (1955), starring Robert Ryan