great pendulous sedge

We have loads of this in the garden, a lovely leafy plant but it can take over. There’s a big clump of it outside one side of the greenhouse and it looks really nice there.
At last Mr I has been assessed by the mental health team. They have prescribed a drug which can help but we’ve been told that it doesn’t work for everyone, so it’s wait and see. The shock for us has been the sudden big decline he suffered. But each dementia case is different and this happens sometimes apparently.