Dividing Japanese Iris?


I have a huge clump of Japanese Iris (I think it is 'Pink Lady') that is 
in full bloom right now.  Because I only have two JIs and have never had 
to divide them (only been in house three years!) I don't know what is 
standard procedure for these--should I divide soon after bloom or wait 
until the fall, winter or spring?  Any other tips about dividing these?  
Do they tend to show less and less bloom or can they go for many years 
without dividing?  This particular clump is in front of a raised bed that 
is part of my vegetable garden and I think that I will have to remove 
part of it this year to avoid shading/crowding the veggies.

Debbie Green
Williamsburg, VA (USDA Zone 7/8)
dxgree@facstaff.wm.edu
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