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This is how they work, I think?
Did not know this.
Should I be gradually cutting out the original ones to encourage new growth in the middle? Otherwise I'm going to end up with a funny crown shape, right.
hugo7-
NB - not a bamboo expert
Looks like yours is in a pot? So I think you will want to be thinning it every year anyway, to slow down how quickly it will outgrow the pot by getting rootbound.
If you want it to be taller, obviously begin by thinning the shortest ones, cutting them off at ground level. I would take them out in a random pattern, not just in the centre.
Because I am a cautious carrot I would take out no more than about 20% in the first year.
lemonade
This is how they work, I think? Mine is like this anyway - each new culm always goes blam straight up to its full height, even when it's as skinny as a blade of grass, then only gets fatter over time, not taller.
I am trying to work out how best to persuade it to limit its height, as I'm pretty sure you are not meant to prune the culms half way up.