Attached are 2 pics, 2 different plants, & in 2 different beds. As you can see main rhizome fans are dwindling away. This has occured on maybe 2 dozen different plants. All were replanted last year, sent up increases and then over the winter, just gradually shriveled up. Some have completely died back to the ground. The increases don't seem affected. Just what should have bloomed this year. If it's rot, I've never seen it manifest itself this way. The rhizomes aren't mushy and not really smelly.