Dahlias in Pots seem stunted
My dahlias are looking beautiful this year. I even have a lot of buds already on my in-ground sown tubers. However my potted tubers seem stunted or something. I have 6 pots of dahlias growing in pots, i've never done them in pots before and at first they were growing great. They look wonderful, nice and healthy, tons of growth and bushy but they have kinda stopped growing at about 18-24 inches. In the past these tubers were always 4-5 feet. Are they root bound? Should I transplant them into the earth? Any thoughts or suggestions?