Aussie Bottle Brush - little dazzler but - the chop!

Hello. I have a 2 and a half year old bottle brush which is putting on a lovely show at the moment. When all these flower have died off - in the Autumn, I would like to start to prune it into a tree. I have taken a photo of the base, as I seem to have 4 main trunks (there's one younger one which will go) and I deem 2 would get the chop - but which 2? Could anyone help me, please?


A good hoeing is worth two waterings.
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Well, the stem on the right has a couple of snags on it, so I’d take that one off. One seems to be growing more horizontally so, unless you can strap it to a pole and persuade it to vertically, I’d take that one off.
After that, I dunno. 🙂
If you live in Derbyshire, as I do.
I have planted a sturdy bamboo stake around about where that white stone is, and tied the two trunks on either side of it. Come Autumn, I shall snip the 2 back left ones ground level. Thank you very much for your opinion. 2 heads are better than one!!
If you live in Derbyshire, as I do.