I started some ornamental grass seed late. Will they grow indoor over the winter,
also can I use a led grow light to develop? I live in zone 6 and did not want to take a chance with frost.
Please advise
Thank you

It would help if you could post a picture, or do you know which grass it is?

Assuming it is a grass meant to grow outside in zone 6, with the proper light you ought to be able to keep them going until spring. But they won't win any beauty pageants.

I think your plants -- assuming they are a variety that is hardy in your zone -- would do better planted in the ground in a protected area, maybe covered with a mulch once the weather turns cold. Then in the spring you could move them to their permanent location.

I have Purple Muhly grass and Chinese silver grass. They are about
4 to 5 inches tall. Growing good at the present time.

Both are beautiful grasses, but without the proper lighting as suggested, they wont do well at all. Check into getting a lighting fixture, they arent they expensive.