|Lamium purpureum, Red Dead-nettle, white flowered form. Hayes Street Farm, 1 December 2014.|
I live near a farm which must be one of the closest to London. Hayes Street Farm is always worth a visit for winter flowers. It is bounded by houses, a main road, and some woods, and has a few nice agricultural weeds of its own. This plant is not far from the houses and might possibly have escaped from a garden, though I don;t think many people would plant it. It's a white-flowered variety of the Red Dead-nettle. Dead-nettles are so called because they have no sting.
|Lamium album, White Dead-nettle. Hayes, 1 December 2014|
|Urtica dioica, Stinging Nettle. Hayes, 2 December 2012.|
|Urtica urens, Small Nettle,. Hayes Street Farm, 17 December 2013.|
|Lycopus europaeus, Gypsywort. Leybourne Lakes Country Park. 27 July 2012.|
It has small clusters of white flowers at the stem nodes.