Category Df 4 Plants of this species and their wild relatives are not frequent but well distributed over the whole Swiss plateau, chances for hybridizing with wild populations are considerable, but under very favourable conditions it can still be safely prevented. Feral populations are known and distributed over an important part of Switzerland. Locations to grow transgenic plants should be carefully chosen in order to avoid hybridization and any ecological effect. Detailed biogeographical studies are necessary to reach this goal. Category Df 5 Plants of this species and their wild relatives are common and well distributed over the whole Swiss plateau, chances for hybridizing with wild populations must be expected and cannot be prevented in field experiments.
Feral populations are frequent and distributed over the whole Switzerland.
In exceptional cases locations to grow transgenic plants can still be carefully chosen in order to avoid hybridization and any ecological effect. Detailed biogeographical studies are necessary to reach this goal. Category Df U Data too scanty or lacking at all, no evaluation possible.