pruning poinsettia

How aggressivly should I prune my poinsettia? I'va had it a year now and I got a couple of red leaves this year, but it's pretty spindly - do I need to leave any leaves?
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On 25 Jan 2004 18:37:56 -0800, snipped-for-privacy@rogers.com (Tim Gray) opined:

You can take it down by 2/3.
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