What plant is this in my garden, and should I keep it?

[Freysimo]

What is this? It's proliferative in my garden and don't know if I should cherish or eradicate it. I don't mind it tbf.

Thalictrum

Thanks, I've looked it up and it looks pretty. Mine never flowers though?

Those are flower stems coming up now.

OK, will wait and see.

Butterflies and bees will enjoy them!

It’s a really nice plant and now quite fashionable (see Chelsea Flower Show). I am envious

It must like my (neglectful) conditions as its growing in the back garden as well.

Meadow rue. Very pretty.