The authorities did publish the 2017 catalogue of allowed hemp cultivars. In Germany the Bundesanstalt für Landwirtschaft und Ernährung (BLE) is overseeing the hemp cultivation.
You can see the list here: Cannabis seed types for the regular farming in Europe 2017.
Also the average THC content of all samples of Bialobrzeskie and Carmagnola
were above the allowed maximal concentration in two years, so these varieties cannot be grown within European Union.