Fraxinus americana, or white ash, is not recommended to plant, due to its high vulnerability to the emerald ash borer, a pest that has decimated ash populations in Ontario. While native to Ontario, white ash requires regular insecticide treatments to manage infestations, making it a poor or costly choice in areas affected by the borer. To that end, white ash appears to be more resistant to borer than other ash species except for blue ash. It prefers moist, organically rich, well-drained loamy soils in full sun.