I've got one one of those too, and I leave it alone in the winter. In spring when it starts to grow new leaves, I take the old brown ones off.

welcome to GoY. I also grow it and leave it and remove the dead leaves in spring. they are not particularly fussy but prrefer a dampish soil in full sun. though having said that I have had them in dry soil. I often leave the seed pods on too, they look pretty when frosted.

By the time spring comes, the old leaves should pull away rather than needing to be cut off

And if you do not want a million seedlings all over the place, cut off the flower heads as soon as they have finished. I forgot 2 years ago and now I have to dismantle the Crevice garden to get rid of them.

Welcome to GoY. We are a friendly bunch.

i wish mine self seeded as freely owdboggy.

Thanks to you all u are a great bunch.