Tree InvasiveThis plant is considered invasive Alnus glutinosa [Black Alder] During establishment growth is fast but upon blooming of abundant flowering and fruiting growth rate slows. Will average 24" to 30" per year.
Shrub Alnus serrulata [Hazel Alder] Closely related to Alnus rugosa, differing chiefly in its leaves, which are usually broadest above the middle and have the margins set with fine, nearly regular teeth. Multi-stemmed habit and tends to sucker.
