Sorbus_wild.html

Sorbus aucuparia (European mountain ash): Ecology

Habitat: Found along fencerows, swamps and streams, this species tolerates extreme acidity-disliking shallow, chalky soils-but is sensitive to pollution. The American mountain ash (Sorbus americana) and the showy mountain ash (S. decora) are native to the US as far south as southwestern Wisconsin, but their range does not extend into Iowa. The American mountain ash (Sorbus americana) is a handsome, spreading, round-topped small tree. It is slow-growing, is intolerant of shade and, although it will grow well on rocky hillsides, prefers moist soils. The photograph shows the American mountain ash (S. americana) growing wild in the mountains of Virginia.

Diseases: This tree is sensitive to most of the pests and diseases that plague the rose family and is therefore not recommended for monoculture avenue plantings where a uniform effect is desired. Canker can be problematic, especially on weakened trees and rust is often also found on alternate hosts, the junipers (Juniperus sp.) and incense cedar (Libocedrus sp.). It is subject to sunscald and frost cracking.
Distribution: Native to Europe and western Asia, the European mountain ash was introduced to the US in colonial times. It is hardy to zone 3 and has naturalized in Canada.

Sorbus aucuparia (European mountain ash): Ecology
	Habitat: Found along fencerows, swamps and streams, this species tolerates extreme acidity-disliking shallow, chalky soils-but is sensitive to pollution. The American mountain ash (Sorbus americana) and the showy mountain ash (S. decora) are native to the US as far south as southwestern Wisconsin, but their range does not extend into Iowa. The American mountain ash (Sorbus americana) is a handsome, spreading, round-topped small tree. It is slow-growing, is intolerant of shade and, although it will grow well on rocky hillsides, prefers moist soils. The photograph shows the American mountain ash (S. americana) growing wild in the mountains of Virginia. Diseases: This tree is sensitive to most of the pests and diseases that plague the rose family and is therefore not recommended for monoculture avenue plantings where a uniform effect is desired. Canker can be problematic, especially on weakened trees and rust is often also found on alternate hosts, the junipers (Juniperus sp.) and incense cedar (Libocedrus sp.). It is subject to sunscald and frost cracking.	Distribution: Native to Europe and western Asia, the European mountain ash was introduced to the US in colonial times. It is hardy to zone 3 and has naturalized in Canada.