Posted: 08/10/2014 at 16:20
It looks like montbretia to me too. Dig it up in 3 or 4 clumps, inspect the soil surface for fallen corms and pick them up and bag them. Then thoroughly dig over the soil removing the remainder of the corms.....each corm is likely to grow. When I have done this I dig soil over several times as I know I will find more corms lurking. Even then you will find a montbretia shoot next summer. just pull it out.
Not really a garden plant........down here montbretia grows wild everywhere