Sources

Where our claims come from.

Every botanical, historical, and ecological reference behind the Pawpaw Foundation site, gathered in one place.

§1References
  1. Largest edible fruit native to North America; botany, taste, and cultivation history: Kentucky State University Pawpaw Program, “The Pawpaw (Asimina triloba).” KSU runs the world’s only full-time pawpaw research program and hosts the USDA National Clonal Germplasm Repository for the species. ↩
  2. Native range (Gulf Coast to the Great Lakes and southern Ontario) and USDA hardiness zones 5–9: USDA NRCS PLANTS Database, Asimina triloba profile, and the KSU Pawpaw Planting Guide. ↩
  3. Pawpaw flowers are self-incompatible (they require cross-pollination from a genetically distinct tree) and are pollinated by flies and beetles rather than bees: KSU Pawpaw Program; Cornell Small Farms, “Pawpaw — A Tropical Fruit for Temperate Climates.” ↩
  4. The pawpaw genus Asimina is the sole larval host of the zebra swallowtail, Protographium marcellus (formerly Eurytides marcellus): University of Florida / IFAS Featured Creatures, EENY-58, “Zebra Swallowtail.” ↩
  5. Short shelf life and fragility keep pawpaws out of commercial grocery distribution: Cornell Small Farms / NCAT ATTRA, “Pawpaw — A Tropical Fruit for Temperate Climates.” ↩
  6. Time to first fruit and the broader history of pawpaw cultivation: KSU Pawpaw Planting Guide; and Andrew Moore, Pawpaw: In Search of America’s Forgotten Fruit (Chelsea Green, 2015). ↩
  7. Lewis & Clark subsisting on pawpaws when provisions ran out: Journals of the Lewis & Clark Expedition, entry of September 18, 1806 (University of Nebraska–Lincoln). ↩
  8. George Washington recorded planting pawpaws at Mount Vernon in his 1785 diary: George Washington’s Mount Vernon, “Pawpaw.” The colorful tale that he chilled them in spring water and ate them by the spoonful is popular folklore with no contemporary documentation — see Colonial Williamsburg, “Forgotten Fruit” (2018) — so we share it as legend, not fact. ↩
  9. The historical monograph shown in Plate 1: James A. Little, The Pawpaw (Asimina triloba): Some Reasons Why It Has Not Been Cultivated, Directions How to Propagate It, Etc. (Clayton, Ind.: O. G. Swindler, 1905), digitized by the Internet Archive. ↩