What is this?

Can anyone identify this plant? It came up where I planted some 'Rip Van Winkle' daffodils several years ago. Thanks.

I think it's Juncus effusus - often used as a marginal or bog plant but will also grow in pots if it gets enough moisture (which everything has this year!) We have had it growing in some pots in shade at one of the flats we rented, we never watered it and it seemed happy enough. Not terribly exciting on it's own but is evergreen and adds some vertical interest - the owner of our flat had it mixed in with some ferns and hostas which looked quite effective.

Some sort of rush, often appears in poorly drained pots of compost and low bits in the garden. I'll have a look and see if I can do a complete ID

I'm pretty sure it's Juncus effusus, which grows wild in damp grasslands. Some nurseries sell it too as a bog plant, but farmers probably look on it as a weed!

I look on it as a weed as well and I'm a big grower of native plants