What's your question? Ask

If you are planting the seeds outdoors, plant them 1-2 weeks after your area's last frost date. If you start them indoors, plant them 6-8 weeks before the last frost date. The seeds should be planted 1/8 inch deep and kept evenly moist, but not too wet, and they should germinate after approximately 1-3 weeks.

After they've gone brown, you can trim these ornamental grasses at any time. Typically, they should be pruned by cutting them back to about 3-5 inches from the ground any time in the fall, winter, or early spring. To prevent them from dropping seeds that could sprout and cause the grass to spread, you should prune before the seedheads open and drop their seeds.

Yes, absolutely! Just dig it up when it is not actively growing. cut the top growth, and divide as you would most grasses. This article will help:

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

I have personal experience with Karl Foerster Feather Reed grass, Calamagrostis. I did not cut it down before winter so it had ample time to drop seed. The original clump slowly increases in size but I had a dozen seedlings or so every year. They were hard to pull by hand and I ended up cutting off the seed heads as they formed. So it is primarily a clump forming grass and does not spread via rhizomes. Unlike Miscanthus, it is not listed as invasive at this time. In a neglected area, it will self-sow.

It is fine to transplant switch grass, but it's best to transplant in early spring- it is a warm season grass that does most of its growing in summer, so this will give it a better chance to get established. However, transplanting in fall might work too. Switch grass is pretty tough.

Warm season grasses won't began to grow until late spring even into early summer.
Give them more time and warmer weather.

https://www.gardeningknowhow.com/ornamental/foliage/northern-sea-oats/northern-sea-oats-grass.htm