Ronaldo-
It is a common characteristic of many bamboo, particularly younger bamboo, to exhibit these characteristics. I have some Moso that I grew from seed 5 years ago which is only about 4' tall and is fairly bushy, rather than erect. I also have a number of other species of bamboo that get bent over when there is weight on the culms from rain or light snow. Where it causes a problem along my driveway, I sometimes tie culms on opposite sides of the clump together so that they counterbalance one another. Occasionally, I'll drive a bamboo pole into the ground in the center of a bunch and tie the culms to that. Generally, as your Moso matures, it will be stronger and stay more upright. But for now you'll just have to live with it. I don't think there is anything wrong with it.

Thanks Kudzu, good to know its just a stage of life thing like gangly teenagers! Do you think it harms the plant if i cut back the problem ones or is it better to just tie them up?

Many thanks,

Ronaldo.

"stage of life thing like gangly teenagers"

Hey! I take offense for that!

Heheheh.