I'm panicing!! I innocently bought a pkg of German camomile seeds thinking I'd love to make my own tea at home instead of storebought. I planted the seeds right in my raised garden bed amist other vegetables. I'm taking it out right now if it's invasive. I garden in zone 5.
Here in the lower mainland it will seed itself as will Dill or Perilla. However I wouldnt consider it invasive. It is a nice looking plant and you will need quite a bit for tea. Whether or not its seed will overwinter in zone five you will find out next year but for goodness sake dont panick.