pic 1 . im not sure what this lovely shrub is?? pic2. Is this a weed? pic 3. Anyone know this unsual shrub?
1 and 3 i agree with Lila ,2 or Hebe or a little Robinia pseudoacacia, for time pruning when berry are down ,because if prune when is in flower not seen berry next year!
To control height of Nandina cut out few tallest stems right to base in spring, leaving rest unpruned.
I'm not certain on that ident (that's why I just said "possibly"!) - but Amorpha fruticosa can be a weed, anyway. Best wait a bit longer to see what others say about it.