Do I trim back Forester Fea Reed Grass now in the fall or wait until spring? Also how close to the ground do I trim back the grass when I trim it?

Usually it would be cut back in spring. Cut it back to about six inches and do it fairly early in spring before it starts into growth or you'll be cutting the new growth as well.

from me too!
I agree, best to wait until spring to cut it back to the ground. There are photos in our database of Feather Reed Grass (Calamagrostis x acutiflora 'Karl Foerster') covered in snow so I'd say definitely wait until spring to prune.

More info here: http://coloradoyardcare.com/20...

I always wait until spring too on mine. And definitely early before the new grass starts to grow. It has great winter interest.