[Wikipedia] Uses: This plant is widely cultivated across Europe for its edible leaves and seeds. It is widely used as a condiment in Northern Europe (particularly Denmark, Norway and Germany). The leaves have a bitter cabbage-like flavour and they are used either in salads or cooked as a leaf vegetable (in cultivar versions). The seeds have been used to make mustard pastes in Europe. (link added by Mary Ann Machi)
Calflora:
Information on California plants for education, research and conservation,
with data contributed by
public and private institutions and individuals.
[web application]. 2025.The Calflora Database
[a non-profit organization].Available:
https://www.calflora.org/(Accessed: 03/28/2025).
