We don`t think this is Chamomile, but worry it might be a member of the Ragwort family. Just in case it is, it would be wise to wear good gloves if you`re pulling it up as Ragwort is poisonous and can get into your bloodstream. It`s also death to horses etc if they eat it as it dies off.
Cannot be at all sure about this as the daisy family is huge. It may be a very innocent daisy. It`s pretty.
This is Crown Daisy (Glebionis coronaria, formerly Chrysanthemum coronaria), in the Chamomile tribe (Anthemideae), of the Daisy family (Asteraceae). It is native to southern Europe, northern Africa, southwestern Asia, and Arabia. Glebionis consists of two species, the other being the Corn Marigold (G. segetum).
The genus is closely related to the Marguerite Daisies (Argyranthemum) of Macaronesia (Canary Is., Madeira, and the Selvagens).