Posted: 10/04/2012 at 21:20
If it has yellow buttercup like flowers during March/April, then I think it looks like Celandine. This is a very invasive weed and impossible to remove by hand as any tiny bit of root/tuber left behind grows a new plant. I have a garden and orchard full of it. I have tried spraying with Roundup, but haven't been very successful - but I do have a lot! The only consolation is that it does seem to die back in May/June. Let me know if you find a cure.