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Here is the NZ Cabbage Tree (Cordyline australis) growing outside my bedroom window. Just over 10 years ago it was just a metre high tuft of simple leaves, now it towers about 3 metres above the height of the roof. Until it got too tall, I used to always pick out the shoots as it tried to branch, so as to encourage a single trunk growth habit. I stopped doing that some years ago when it got too tall, and it has now developed a rather broad head/crown. Remember this plant bifurcates, splits into two growth points, each time a branch end tip develops a flower-stalk. If I could get a suitable tall commercial type laddder then I would further prune the crown so as to continue a tall skinny single trunk grown habit. ...and yes I was able to wiggle through the greenery enough to wrench these new side-growths from off the back of the trunk.