Erysimum cheiranthoides (Peltoukonnauris)

In Europe E.cheiranthoides is a very common and bad weed. It can be annual or biennial. Anyway it is difficult to destroy because of very fast growing and the numerous seed production. I let most of them to grow in peace because of their beautiful flowers and also their function as food plants to most Pieridae -butterflies and some geometrid moths as Xanthorhoe fluctuata.