Barbarea vulgaris, also called as Bittercress, Herb Barbara, Rocketcress, Yellow Rocketcress, Winter Rocket, and Wound Rocket, is a biennial herb native to Europe.
The plant is naturally resistant to some insect species. In the case of the diamondback moth, Plutella xylostella, the resistance is caused by saponins. Other plant chemicals in this species are the glucosinolates glucobarbarin and glucobrassicin that attract cabbage white butterflies such as Pieris rapae. Said to be one of the plants constituting a spring tonic at its latitude.