Rob, It is normal for a rhizome to die back after it has bloomed. It only blooms once, then dies back. Usually it sends out some increases first, and they will be blooming in future years. Are there other new rhizomes that are growing? My experience is that they shrivel up the next year, not the same year that they bloomed. Are these newly planted? This year? Last Year? Are they soft and mushy and smelly? Is the whole clump dead?
