I have 3 dianthus plants that are starting to bloom in a large square container, approximately 12"x12"x6". They're getting full sun and I think they'll do best in my partly shaded in-ground garden bed. The problem is that this container is heavy, too heavy for me to sort of maneuver it sideways and pull the plants out. So I have to dig them out. I'm worried about ruining the roots though. What's the best way to do this?