With such a lovely day, I started some tidying up in the garden. I grew some Lychnis Coronaria from seed and it flowered well last year. But its lower stems lost their leaves and look bad even when it was in flower, so I moved it to the back of the border last year after it flowered. The plants have green leaves showing, though it is not clear if it is this year's growth or last year's. But on tidying up, the roots felt very brittle as if the plant was dead. Is this normal? I don't see how they can be dead with green leaves.