To avoid self-pollination, avocado trees alternate between opening male and female flowers at different times of day. We can see this in the pulsating rhythm of avocado flowers opening and closing throughout the day. “Having these two types that reciprocally and synchronously flower male and female allows avocados to exchange and use pollen throughout the whole day.” Jeffrey Groh stands behind pots of avocado trees in a greenhouse. This project used the UC Davis High Performance Computing Core Facility, the UC Lindcove and South Coast Research and Extension Centers in Exeter and Irvine, and UC Quail Ridge Reserve.