Students majoring in most other disciplines (except biology, see below) can minor in botany. The botany minor requires a total of 15 credit hours of botany coursework. See the course catalog here for details.
Majors in botany can minor in most other disciplines, and this is a good way to organize students’ electives around areas of interest. Note that botany majors cannot minor in biology, nor can biology majors minor in botany (the curricula for the botany and biology majors are too similar).