Posted: 01/05/2017 at 11:43
Arum maculatum or possibly Arum italicum.if it has variegated leaves. Not the easiest of things to get rid off either. When digging out the bulbs you need to make sure you get all the tiny ones as well.
If you use weed killer then the Roundup Gel painted on to the leaves can work. BUT, it is a slow job.
Don't let them berry either of you will have seedlings coming up as well.