I am in Wisconsin, zone 5. In my garden bed facing south, I have two plants that I do not remember planting, flowering right now. The tallest one is 33 inches tall and the flowers are a bright purple. In looking at the leaves, and flowers, I think it is a Penstemon strictus or possibly a Penstemon barbatus'Purpureus'. My question is will I kill them, if I try and move them? Should I wait until they stop flowering? Do they flower all summer off and on, or do they flower and stop? They are in the front of my flower bed and covering smaller plants. They are beautiful plants with bright flowers and they match my color scheme, but they're in the wrong place.