You are so very welcome!* Glad to read that you checked out the invasiveness of this plant,* Hopefully the person at your local nursery is correct, but unless the person at your local nursery is a botanist or environmentalist, I would suggest you check with your local extension service, the United States Department of Agriculture or the Department of Natural Resources to find out if it's truly not invasive in your area.*
When weeding, the best way to make sure you are removing a weed and not a valuable plant is to pull on it. If it comes out of the ground easily, it is a valuable plant.