Help identify plant.

It's lamiastrum galeobdolon, commonly known as yellow archangel. It's recommended as a groundcover, but only for very large areas as it's absolutely rampant

Thanks Andrew. I have been trying to remember the name of this for hours. Very frustrating when you know something and just cannot quite get it from brain to keyboard.

Sure it's not Lamium maculatum? I thought that Lamiastrum was a more upright plant. If it produces pink or white blooms in spring or summer, it's a Lamium.