There has been a dispute as to the real parentage of this mango cultivar. Glenn was reportedly a seedling of Saigon that was planted in Miami Florida in 1940 according to Roscoe Glenn. Originally, it was publicized as a Haden seedling. But analysis made in 2005 found that Haden was indeed the most likely parentage of Glenn based on its color, flavor, and mono embryonic trait.
Glenn has a very attractive appearance with a mild, sweet flavor. The fruits are oval to oblong, with a rounded base and a pointed apex which lacks a beak and usually weighing from 300-600 g . It has thin but tough skin with a bright yellow background and a pastel orange-red blush on the shoulders. The deep yellow flesh has no fiber and is soft and silky, with a rich, sweet and aromatic flavor. ‘Glenn’ is a favorite in home gardens of Florida because it may be maintained at 10 ft throughout its life with consistent production, disease tolerance and superb eating quality. The fruit ripens June to July making it the most popular early season mango in Florida.