Help with these plants!?

Hi fellow gardeners looking for help to identify these plants/ grasses
They are landscaped in my workplace and I always admire them

 

Hi, the first one could well be Salvia nemorosa. The second photo I wouldn't like to say, the third could be Miscanthus underplanted with Anemone x hybrida 'Honorine Jobert'. The fourth is Persicaria.

 

The last one is Persicaria affinis ...

 

4. Agree with others Persicaria affinis...can become a little invasive.

 

The second grass could be Calmagrostis x acutiflora 'Karl Foerster'.

 

OK invasive I dont want so best steer clear of this guy!!

It does look good in a mass planting setting and flowers for quite a while but for where I am planting perhaps not a good idea

 

Re Persicaria affinis - It isn't invasive in my garden, it just stays where I planted it, forming a little mat. However, I suppose in some situations it may become invasive.