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Unfortunately, true pampas grass will only slightly darken from the standard blooming variety, and with very little color change. There are other grasses that are marketed as pampas grass, but are really another species. They will change many colors depending on the cultivar that you choose. There will be no real way to change the color of your grass, unfortunately.

This article will give you more information on the care of these: https://www.gardeningknowhow.com/ornamental/foliage/pampas-grass/growing-pampas-grass.htm

You should plant it in pots and bring it inside for winter. Unless you know that you have a "hardy" pampas grass (more cold tolerant than the standard varieties), it is not suitable for your climate.

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

The conflicting information arises for the use pampas grass for 2 different plants. The traditional one is Cortaderia selloana and it is not hardy in zone 5. Another plant is called "hardy pampass grass".It is Erianthus ravennae and is hardy to zone 5. It doesn't have plumes that are quite as spectacular as the southern pampas grass but the overall effect is similar. I hope this helps!

Pampas grass is incredibly prolific when it comes to seed production; a single plant can bear up to a million seeds over its lifetime. The self-sowing seeds can sprout in almost any kind of soil. Can't give you odds, but I would say likely you would have some reseeding.

There are many cultivars that will remain shorter, but most can get a little over 2 meters tall. They can grow relatively fast, but they won't fill out for two or three years. Eventually it will spread to fill out the area completely. I would suggest visiting a local nursery to see their varieties, or look online making sure to pay attention to the mature height. You can get just about any size container of this grass, but the bigger and more established it is, the more expensive it will be.

There are 2 basic categories of grasses, warm and cool season grasses. Most of our lawns are cool season grasses and green up in spring. Pampas is most definitely a warm season grass and won't show green until the soil warms. Give it another month. However, now is the perfect time to cut it down to several inches if you haven't done so already.