In your zone, you could start the seed in late summer, and the seedlings would probably be established well enough to survive your mild winter. You can do it either in containers or directly in the garden.

I must add a word of caution..the seed Parks sells is Miscanthus sinensis 'New Hybrids.' It consists of a mix of seed from several different hybrids, blooming at different times. I've grown it from seed for several years, and in my warm zone 7 garden it re-seeds quite freely. So much so, in fact, I have removed it.

Thank You Donn. Any tips on how much to water after I plant outside. Or any fertilizers I may need to use ? And should I plant directly in my soil. It is kinda sandy. Should I buy some garden soil ?

The seeds need to be kept moist until they germinate, so you'll need to mist the area where they are sown on a regular basis. After germination, misting must continue unless you have regular rainfall.

No fertilizer is needed, and sandy loam soil is the best for this grass.

If you are going to sow the seed directly in the garden, it would be best to cluster 12-15 seeds together, and cover them with a very thin (1/16") layer of soil.