I would still start cool season grasses from seed now, because they'll continue to grow through the fall, and have more time to establish good root systems.

I wouldn't start warm season grasses this late. They tend to go dormant in the fall, and probably wouldn't have time to get established.

Of course, if you have a good heated greenhouse, with quality lighting, you can start most grasses any time you like.

I'm just starting with ornamental grasses and would like to know the names of some cool season grasses that I could try to start from seed this late in the season.

Thanks much!

Good seed-grown cool season grasses:

Festuca glauca - Blue Fescue
Deschampsia caespitosa - Tufted Hairgrass
Sesleria caerulea - Blue Moor Grass
Luzula nivea - Snowy Woodrush
Helictotrichon sempervirens - Blue Oat Grass

Thanks much for the info!