Ive noticed that many of the plants in california are thought of as nice garden plants. Some have been here for a while. Mustard grows wild all over the central coast. It is said to have been planted along the mission trails by Fr. Junipero Serra to guide travelers to the missions. Its one of the easier to pull weeds. The brooms are a different story. I keep seeing nurseries sell them. they grow all over this nearby school. BJ