Lamium or Dead Nettle
Dead Nettle; Lamium Galeobdolon:
The RHS says lamium is an easy to grow ground-cover plant. This means it’s tough, almost indestructible and it spreads easily.
So careful where you plant this, it should only be used to plant in places so far only weeds seem to do well, and as it’s prettier than a weed – it’s nicer to look at.
Don’t plant it in a prepared garden border though, it will become a thug!