Persicaria, perennial (Burnhamthorpe and Tomken)

First photo is to show the red spires. Plant grows 4 to 5 feet tall. After many years, I need to reduce the size of this. I’ve dug out several clumps today. Some of the tops have been cut off . Should regrow from the tubers . Quick pick up is best for success. Tomken and Burnhamthorpe