Don Bay has been in the citrus business for over 50 years now, and according to him, his most recent growing endeavor has been the most challenging. Alongside his son Darren and grandson Luke, Don cultivates Sumo Citrus®, one of the most difficult fruits to grow. The Bay family runs San Joaquin Growers Ranch in Porterville, California, one of the farms where the fruit is grown in the United States.

Sumo Citrus was originally developed in Japan, and is an extraordinary hybrid of mandarin, pomelo and navel oranges.

The fruit is temperamental, and it can take time to get a thriving crop. The trees require year-round care, and it takes five years from seed to fruit until they're ready for harvest. Thanks to expert citrus growers like the Bay family though, Sumo Citrus have flourished in California. Don and his son Darren worked together through trial and error to perfect their crop of Sumo Citrus. Darren is now an expert on cultivating this famously temperamental fruit, and his son Luke is learning from him every step of the way.

Don, Darren and Luke BayAll photos courtesy of Sumo Citrus

"Luke's been involved as early as he could come out," Darren said in a YouTube video.

"Having both my son and grandson [working with me] is basically what I've dreamt about," said Don. "To have been able to develop this orchard and have them work on it and work with me — then I don't have to do all the work."