Alnus glutinosaAlnus glutinosa

  • BOTANICAL NAME: Alnus glutinosa
  • PRONUNCIATION: AL-nus glu-ti-NO-sa
  • COMMON NAME: Common Alder, Black Alder
  • FAMILY: Betulaceae
  • NATIVITY: Europe, western Asia, northern Africa
  • GROWTH HABIT: Pyramidal to upright oval tree growing 40'-60' tall. Often grown multistemmed.
  • HARDINESS: Zone 3-7
  • CULTURE: Native to moist soils where it will colonize rapidly; tolerates standing water to dry sites. Acid or slightly alkaline soils in sun to part shade. A nitrogen fixer.
  • LANDSCAPE USE: Good medium tree for wet sites and naturalizing.
  • FOLIAGE: Alternate, simple, 2"-4" long, broadly oval, doubly serrate.
  • BUDS: Valvate buds 1/4"-1/2" long, stalked, red to red-brown. Male catkins present from fall to spring and offer a good identification feature.
  • BARK: Greenish brown stems.
  • FRUIT: Small winged nutlet borne in woody persistent strobile.
  • PROPAGATION: Seeds, grafting of cultivars.
  • PESTS: Cankers may attack stems.
    • 'Laciniata' - Leaves lobed and cut. Grows 50'-70' tall.
    • 'Pyramidalis' - Upright, columnar form, 40'-50' tall.



University of Delaware

University of Delaware Botanic GardensNewark, DE 19716Phone: 302 831-0153