asters; potentilla

Thanks to the weird winter, my New England asters--and some mums--are 
beginning to bloom.  (It is May, isn't it??)  

When they are finished  blooming, should I cut them back?  I recall 
hearing a local horticulturist suggesting that when mums do that, they 
should be cut back hard after bloom and they should bloom again at the 
usual time.  D'ya suppose I should treat the asters the same way?

Also, while we're on the subject of cutting back...should the stems of 
potentilla be cut back after they bloom?  I have some I grew from seed 
and they didn't bloom much last year (their first).  I haven't grown 
them before, so I'm not really certain what to expect from them.

Thanks all!
Nancy Lowe
Arkansas, zone 7



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