should my pink muily grass be coming outgreen by now.

Question

some of mine was planted last fall and still looks brown.

Answer 1

Unfortunately I have had many reports of Pink Muhly grass not surviving last winter. Many gardeners reporting well established plants not coming back.
If you have no signs of new growth, these is nothing that can bring the grass back.

https://www.gardeningknowhow.com/ornamental/foliage/muhly-grass/growing-muhly-grass.htm