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Rowan, American Mountain ash

General
Common NameRowan, American Mountain ash
Latin NameSorbus americana Marsh., S. aucuparia
CategoryFruits 
Family 
Variety 
Visual Traits
Flowerwhite; May-July
Foliage/Fall leaf colororange-yellow to reddish purple
Fruitorange to red; berry-like pome; August- September; persistent through winter
Height10-30 ft
Spread4-6 ft
Cultivation
Propagation methodseed, b&b; bare root
Seed treatment and storagecold stratification for more than 60days at 33-41F
Sowing seedfall or early winter or July-August for germination following spring (no treatment)
Critters
Insect and invertebrate pestsaphids, pear leaf beatle, blister mite, Japanese leafhopper, roundheaded borer, mountainash sawfly, scales
Pathogensfireblight, crown gall, canker, leaf rusts
Wildlife Pestspreferred browse of white-tail deer
Soils
Compaction (tolerance)intolerant
Moisture and drainagewell-drained; stunted in dry soils
pH4.7-6.0
Salt toleranceintolerant
Soils and topographymoist habitats from swamp borders to rocky hillsides; woodland edges and gaps
Textureloamy, clay to sand
Growth Pattern
Growth rateslow
Longevityshort
Root habitfibrous
Habitat and Climate
Fire toleranceintolerant
Frost-free days (FFD)90
Hardiness Zone(2) 3-6 (7)
Native RangeNortheastern North America
Rainfall / humidity24-60in
Light
Light recommendationfull sun
Shade toleranceintolerant
Special Notes
Note 1pest-ridden when stressed
Note 2Sorbus aucuparia potentially invasive