The plumes look like Pennisetum...possibly P. alopecuroides 'Moudry'.

the plumes looks like it contains seeds. Am I right? If so, will the seeds produce the same looks similar to that of its parent?

If it's 'Moudry' it will. I get several volunteers every year. You have to wait until well into winter to harvest the seeds. When the stem under the seedhead turns beige/brown, the seeds will be ripe. The way to test is to bend a seedhead down into a paper bag and shake it. The carriers should fall right off.

Here's what the carriers and seeds look like:

{{gwi:873660}}

The seeds pinch right out. Couldn't be easier. Keep only the plump smooth seeds, and discard the scraggly wrinkled ones.

awesome! I'll try it in a few :)

I tried over the weekend. Each carrier didn't have any seed at all. :(

Surely some seeds dropped onto the soil by the plant. I think I'd take a trowel and sort of rough up the dirt and pack it down so the birds don't get them. Maybe you will be surprised come next spring with some volunteers no matter what you do. I ran across a couple of sites listing some Pennisetums as a pest under certain conditions.