Answer: Bottlebrush should live for more than 6 years so there must be something else going on with your plant. I'd suspect some root problems (too much or too little water or an overdose of fertilizer). You can prune your plant back to see if it responds with additional new growth, or you can dig it up and inspect the roots to see if they are still alive - snap a few in two to see what they look like inside (creamy white roots are healthy; rusty colored or brown roots are dead). If the roots look healthy, replant it and then prune it back a bit. If the roots look dead, your bottlebrush is a goner. Hope it's still alive!
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