Hass
While dozens of cultivars are grown, the Hass avocado is today the most common. It produces fruit year-round and accounts for 80 percent of cultivated avocados in the world.[20][6][21] All Hass avocado trees are descended from a single "mother tree" raised by a mail carrier named Rudolph Hass, of La Habra Heights, California.[5][21] Hass patented the productive tree in 1935. The "mother tree", of uncertain subspecies, died of root rot and was cut down in September, 2002.[6][21]