Hello! I am growing some sage a few months now, and this plant grew along it by itself! An idea what it could be??
Lamb's Quarters, Chenopodium album http://www.cloudnet.com/~djeans/FlwPlant/lambsQuarters.htm HTH| Chris
Fat-hen (Chenopodium album). "Lamb's Quarters" does not occur in Europe. http://ip30.eti.uva.nl/BIS/flora.php?selected=beschrijving&menuentry=soorten&id=1815
I always call that a milk weed. Not sure if thats the real name, but thats what my mom always called them. Definately a weed though.
Looks like Chenopodium album, but the plant is small. It could be something else. Chenopodium album is a weed in many places around the world now. Distribution from Flora Europaea