Growing Things: How to prune and care for Potentillas

Q: I wonder if you could give me some advice. Potentillas are not my favourite shrub but because the deer and elk have the same attitude towards Potentilla, I am beginning to like it.  We are attempting to xeriscape our front yard.  We have several Potentilla bushes, some planted last year and more this year.   They are doing very well and I would like some information regarding pruning.  I see bushes everywhere that are large, appear to be overgrown and do not bloom ver