Blackberry bush question?

I have a blackberry bush which produces blackberries it is getting to be a good size but of course it always grow, my questions is "I want to get a clipping off to start for my mom, since she gives my plant clippings from her items, where would I cut on this blackberry bush to start a clipping and would I... show more I have a blackberry bush which produces blackberries it is getting to be a good size but of course it always grow, my questions is "I want to get a clipping off to start for my mom, since she gives my plant clippings from her items, where would I cut on this blackberry bush to start a clipping and would I start it in water till it gains its roots"?
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