The Miscanthus ( taller grasses in the background) need to be cut back once a year in early spring. The Mexican Feather Grasses in the foreground can be 'combed' with a metal rake to remove the heavy dried material. The grass then pops back up and looks fresh. The Pampas grass you mentioned is a very invasive plant in California and should not be planted unless it is a sterile cultivar.

I go through heck with my Miscanthus now as it is... was hoping these would be less to maintain.. but I think they all are work! The have the Pampas (white right?) a lot down the Jersey shore.. more of a specimen than anything.. by invasive.. you mean the centers getting huge? Thanks!

Pampas spread, so the problem is not just the centers getting huge, but a huge number of the plants pop up everywhere when the climate is right for them

Many grasses, tho lovely are now classified as invasive and no longer recommended in some states.

I think that is correct. I'm in N. CA and I will never allow it again, it re seeds so easily, the tiniest spot even in blacktop driveway it could thrive. I still think it is pretty but so Was Heavenly Blue Morning Glory which can swallow an acre before you realize! I have been switching to sedge, thyme and succulants... so many beautiful plants to pick from, the lists are endless.

There are many native grasses that are absolutely beautiful. Some of my favorites are Switch grasses, Muhly grasses, and native Carex grasses.