Helleborus question

My helleborus is rather large and I would like to split it in half. Does anyone know how to split them and when is the best time?
Kim Topsail, Newfoundland Zone 6
E-mail: snipped-for-privacy@mun.ca
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Check here http://www.hellebores.org/growing/propagating.html for all the info you need on propogating hellaborus.
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Ann, gardening in Zone 6a
South of Boston, Massachusetts
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