The original 'Irwin' tree was a seedling of the 'Lippens' cultivar that was open-cross pollinated with 'Haden', planted on the property of F.D. Irwin in Miami, Florida in 1939. The tree first bore fruit in 1945 and was named and described in 1949. The fruit gained commercial acceptance due to its good production, flavor, relative disease resistance, and attractive color. 'Irwin' has also been sold as a nursery stock tree for home growing in Florida.
'Irwin' trees are planted in the collections of the USDA's germplasm repository in Miami, the University of Florida's Tropical Research and Education Center in Homestead, Florida, and the Miami-Dade Fruit and Spice Park, also in Homestead.
'Irwin' fruit is of ovate shape, with a rounded base and a pointed apex, lacking a beak. The smooth skin develops an eye-catching dark red blush at maturity. The flesh is yellow and has a mild but sweet flavor and a pleasant aroma. It is fiberless and contains a monoembryonic seed. The fruit typically mature from June to July in Florida and is often born in clusters.
The trees are moderately vigorous growers capable of exceeding 20 feet in height if left unpruned, developing open canopies.
- http://www.ars-grin.gov/cgi-bin/npgs/acc/display.pl?1207222 USDA, ARS, National Genetic Resources Program. Germplasm Resources Information Network - (GRIN). [Online Database] National Germplasm Resources Laboratory, Beltsville, Maryland.
- http://trec.ifas.ufl.edu/crane/pdfs/TREC-Fruit-Collections.pdf Page 3, #48
- Campbell, Richard J. (1992). A Guide to Mangos in Florida. Fairchild Tropical Garden. p. 81. ISBN 0-9632264-0-1.
- http://edis.ifas.ufl.edu/mg216 Table 1