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Silver Mound grows in zones 4-9/
The plant will go dormant and die back in the fall and grow back in spring.
Here is a link with more information.

https://www.gardeningknowhow.com/ornamental/foliage/artemisia/silver-mound-care.htm

It appears that this plant will tolerate the juglone of the black walnut. This article will help:https://www.extension.umn.edu/garden/yard-garden/landscaping/best-plants-for-tough-sites/docs/08464-complete.pdf

Gardening Know How doesn't sell seeds, but Artemisia annua seeds can be ordered from many online retailers or obtained from local gardening stores or gardeners.

You can absolutely transplant your artemisia when weather cools down. If you have a garage, it might survive winter there where desiccating winter winds won't affect it. But you will have to water it (infrequently) to keep the roots from completely drying out. In the ground, leave the leaf stems intact as they will trap fallen tree leaves and help to insulate the plant. Snow is also a great insulator from those drying winds. Roots can freeze and still make it through the winter unless they are dried out. This is why watering well into fall is very important to plants.

There are a few things that need to be done in order to maintain the plant. Division and pruning to maintain shape and order will be necessary. Pruning will, also, cause it to bush out. This article will offer more information on the care of the plant:

https://www.gardeningknowhow.com/ornamental/foliage/artemisia/silver-mound-care.htm