Once you've got a good root/rhizome established (which, after 3 years you should), then you should split the root - not transplant shoots. One technique - get a sharp shovel and just drive through the middle of the root and dig up the half you want to relocate. There's a video on Basic Brewing (3/16/09) - though not that detailed.
I believe the best time is early spring before while the rhizome is still dormant and before any sprouts appears (I could be wrong on this).
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Atomic Dog Brewery
On Deck: Centennial IPA, Dry Irish Stout
P: Cascade Pale Ale
S: (nothing!)
K: (nothing!)
T: Carbed Crystal Light, Root Beer, Vanilla Cream Soda, Tripel IPA, Apfelwein
e^(pi*i) + 1 = 0
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