How tall could a bamboo-like (i.e hollow with nodes) tree be ? It should be at very least 1.5m of diameter and walls no more than 20cm thick. The internodes should be 2 to 5 meter long. I think it would need rhizomes etc and grow like bamboo does but you can change whatever you want. Something else I also would like to know is how fast would it grow?
Note that I'm asking only for the resistance to mecanical stresses like tree's own weight or wind even though the first culms would probably be shorter and with several ones wind is less of an issue.