dahlia imperialis,etc.

 
I have two dahlia imperialis plants grown from seed this year, both single stem 12 feet +, blooming profusely for the past month or so. Now what ? Just lop them off when they're through flowering , like more mundane perennials ? For that matter, what about the equally large montanoa grandiflora ? I'm on the flats in Richmond, where the wind can be rough on the tall stuff. Thanx.
 
Steve Brown
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