Today a very big and healthy looking Greater Celandine (NL: Stinkende gouw). It is protected from passers by in a tiny raised bed, with hardly any competition. A good spot to harvest useful weeds. This plant is toxic; the bright yellow sap inside is extremely irritant but dabbed on some areas of skin, it may help fight herpes and small skin growths.
Urban Herbology 
I guess that puts it in the same basket as petty spurge over here? Apparently it has been used as a folk remedy to treat skin cancers for years and it is being looked into to try to isolate compounds that may be beneficial for this reason.
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