If placed within proper range of a 蜂房 (5 squares in any cardinal direction), a Sunflower will cause the 蜂蜜 produced to become more profitable.
Since both sunflowers and their seeds can be processed into oil using an 产油机, when processing sunflowers into oil it is more profitable to first process the crop into 向日葵种子 using a 种子生产器. This will yield on average 2 seeds, producing on average 2 oil for 1 sunflower instead of only 1 oil.