Tree of Heaven (Ailanthus altissima)
Female tree of heaven. Photo by Chuck Bargeron, University of Georgia, Bugwood.org
*Distinguishing characteristics separating tree of heaven from black walnut, staghorn sumac, and ash
SIZE AND COMPETITION
Can grow 60-100 feet tall (large, fast growing tree)
Clonally reproduces by root sprouts
Cut or damaged trees may spread prolifically by root sprouts (important for management considerations)
Intolerant to shade - often bunching along roadways (very similar to staghorn sumac)
Tolerant of poor to rich soils
Allelopathic - produces toxins that inhibits growth of nearby plants
Large tree of heaven. Beschreibung: Götterbaum (Ailanthus altissima ) Fotograf, Darkone, 5. September 2005. Wikipedia. https://creativecommons.org/licenses/by-sa/4.0/legalcode
Tree of heaven clones. Photo by David J. Moorehead, Forestry Images
Over- and understory trees-of-heaven. Photo by John M. Randall, The Nature Conservancy
SHOOTS AND BARK
Young shoots start out green but age to a greenish cream or light brown
Young tree of heaven. Photo by Barbara Radisavljevic ©
Maturing bark variable, but often resembles a cantaloupe - light silver or grey to brown
Available from http://www.bio.brandeis.edu/fieldbio/emmae24/Simaroubaceae/TreeofHeavenbark.jpg
Department of Natural Resource Ecology and Management, Iowa State University, Ames, Iowa. Available from https://www.extension.iastate.edu/forestry/iowa_trees/trees/tree_of_heaven.html
Old tree of heaven bark. Photo by Annemarie Smith, ODNR, Division of Forestry, Bugwood.org
LEAVES
Leaf is compound, 1 - 4 feet long (10 - 40 leaflets per leaf)
Alternate arrangement
Smooth leaflet margins*
Underside of leaflet base has glands*
1 or 2 glandular teeth at base of leaflets*
Short petiolule attaches leaflet to rachis
Tree of heaven leaflet margin and attachment. Photo by Dave Jackson, PennState
Tree of heaven leaflet underside showing smooth margin, gland, and glandular tooth. Photo by NYSIPM
TWIGS
Greenish, pink, or reddish to brown
Stout and hairless twigs but may look slightly fuzzy
V or heart shaped leaf scars*
Brown spongy pith*
Tree of heaven twigs. Photo by Steven J. Baskauf, Vanderbilt University
FRUIT
Clusters of fruit are samaras (winged and papery) each with one seed (black walnut and staghorn sumac do not have samaras but ash do)
Each fruit 1 to 2 inches long
One female tree may produce more than 300,000 seeds yearly
Wind dispersed
Tree of heaven fruit (samaras). Photo by Gary Huntzinger, Rutgers NJAES Cooperative Extension
OTHER
May smell rancid; often described as like “cat urine” or “burnt peanut butter” when foliage is crushed*
Dioecious
Leaves are usually retained and stay green later in the season as opposed to staghorn sumac and black walnut
QUICK ID SEPARATING TREE OF HEAVEN FROM BLACK WALNUT, STAGHORN SUMAC, AND ASH
Tree of heaven have smooth leaflet margins
Tree of heaven have glandular teeth
Tree of heaven have glands on underside of leaflet base
