I've had Bartzella for a few years now. Only thing I did was give it extra water in the hottest driest part of the summer. It doubled in size the the next spring and had over 30 flowers. This year is looking like a repeat of last year. The only thing I do in the spring is cut back the dead stems. Make sure they are dead though as the stems do not all die back to the ground like the herbaceous peonies do. Please try and ignore the weeds but this picture shows Bartzella the first spring after planting. I planted it the spring of 2010 and this was taken last spring 2011.
