Q.Where To Plant Stevia In The Garden?
I’ve searched and searched and can’t find any info on companion planting stevia in the garden. Other herbs I have an idea of a category of where and how to use them and get the best results, but I just can’t seem to find anything on it. Marjoram and Thyme were the only companions I found, but that doesn’t say veggies. So maybe one more question then, should I just make a box in the garden just for the stevia then??

Certified GKH Gardening Expert
You could plant it according to how you will use it, how often you will harvest, and where it is convenient for your access.
For example, if your other herbs are near the back door for easy access, I would put it there. (I saw the marjoram and thyme companions, too.)
You are on the borderline hardiness zone, so you may want to plant it in a pot and bring it inside for the winter. Here is more info:
https://www.gardeningknowhow.com/edible/herbs/stevia/stevia-plant-care.htm