Looks like Japanese Anemone

I agree

Me too - mines taken over the garden this year - needs to be controlled!

Know just what you mean Cammomile, had to dig all mine up last year, thin them out and replant. I wouldn't be without them though, and the bees love them.

They're not the easiest thing to eradicate.

One of my customer's asked me to get rid of a 2 metre diameter clump earlier this year.

I've sprayed it with round up 3 times and hoed it to the ground a week after each treatment and it still keeps coming back.

Looks like I'll have to dig it out.

Same here, very pretty but spreads like mad. Ours has come up feet away from the main plant and is even coming up in the lawn

very easy to eradicate....roundup is your friend !!!!!! lol

Edit. @ Anchorman. I always use roundup at twice the recommended dose for invasive or woody stuff and it worked a treat. Ive even used it diluted 50/50 to stump kill a willow that i had just sawn down with very good results

I'll give that a try Andy

Anchorman, do you use the domestic or agricultural roundup?

The clump I am trying to get rid of has been treated with Agricultural strength Glyetc. every time a shoot appears for the last 3 years. It is still coming up. I have even tried Lawn Weed killer on it I noticed some new growth yesterday. The ones in the border which I thought I had eliminated are now in flower in the middle of other plants. I think I will dig out everything else and leave the border down to just anemones.

Agricultural strength Glyphosate , 2ndhand, but i will try Andy's suggestion and double the concentration

The trouble with using the wrong concentration is that too strong a dose and the plant does not absorb it and so it loses its effectiveness.

that's what i do when dealing with real thugs like ground elder and bindweed. Not that I have much of either left now.