Keitt was reportedly a seedling of the Mulgoba cultivar that was planted on the property of Mrs. J.N. Keitt in Homestead, Florida in 1939. However, recent genetic analysis suggests Keitt was actually a seedling of Brooks (which would help explain its late-season ripening and large fruit size).[1]The cultivar was selected and named in 1945, after which it quickly gained commercial acceptance for its flavor, lack of fiber, and productivity. The fruit lacked color [2], however, and was much larger than most varieties, limiting it from becoming a widespread commercial staple. It did gain popularity among Florida home growers and remains one of the more widely planted trees in the state today.
The tree is a vigorous grower, but tends not to reach heights much over 20 feet. It has a low spreading habit that is not as compact as most other mango trees. Fruit production is relatively heavy and consistent.
The fruit is comparatively large, some reaching up to several pounds in weight. They are of ovoid shape with a slight beak at the bottom. The skin color is typically green with some light red blush. The flesh is fiberless, tangy and sweet, with a monoembryonic seed. The fruit generally has good disease resistance, and ripens from August until September, often into October as well, making it one of the more valued late-season varieties.