Welcome to the forums. It is Lamium galeobdolon...yellow dead nettle.yellow archangel etc It goes under a few names..eg Lamium galeobdolon silberteppich/Lamium galobdolon Hermans Pride etc. Lamium galeobdolon - Wikipedia Lamium 'Silberteppich' - The Beth Chatto Gardens PlantFiles: Deadnettle, Yellow Archangel It can become very invasive.