Of course, rape flowers are planted in ordinary rural areas for mustard oil.

But Wuyuan grows rape flowers for tourism. Wuyuan countryside has always planted rape flowers to extract oil, but in recent years, due to the influence of market economy, many local farmers also want to grow other crops. However, the local government of Wuyuan put tourism development in the front, and one of the selling points of Wuyuan tourism is to see pieces of golden rape flowers. So as compensation, farmers who grow rape flowers can get government subsidies, while others don't.

I don't know if there are any imitations in other places.