Tree of Heaven: How to Identify It and Why Removing It Fights Lanternfly

If you want to meaningfully reduce spotted lanternfly pressure on your property, there is no single action more powerful than removing tree of heaven (Ailanthus altissima). This fast-growing invasive from China is SLF's preferred host — the tree it returns to for feeding and reproduction when all else is equal. Eliminating it starves the population of its preferred refugium and forces SLF to disperse rather than concentrate.

But getting rid of tree of heaven is not simple. Cut it down without treating the stump, and it comes back. Cut it down and leave the roots, and it comes back harder. This guide covers identification, the biological relationship between TOH and SLF, and the control methods that actually work — plus what to plant instead.

Why Tree of Heaven and Spotted Lanternfly Are So Tightly Linked

Ailanthus altissima and Lycorma delicatula share a native range in China and have co-evolved. SLF can complete its full life cycle on over 70 host plant species in North America, but research consistently shows:

SLF aggregates preferentially on TOH when given a choice
Egg-laying rates are higher on TOH than on most other hosts
SLF nymphs develop faster and with higher survival rates on TOH
TOH emits volatile compounds (particularly ailanthone precursors) that are hypothesized to serve as olfactory cues attracting SLF

In practice, this means a mature tree of heaven on your property acts as an anchor point — drawing SLF in from surrounding areas and sustaining larger local populations than alternative hosts would support.

> "Properties with mature tree of heaven consistently show 3–5x higher SLF nymph counts compared to properties without it. Removing TOH is the most durable IPM strategy available to landowners." — Penn State Extension SLF program briefing, 2024

Identification Guide: How to Recognize Tree of Heaven

Tree of heaven is frequently confused with two native species: staghorn sumac (Rhus typhina) and black walnut (Juglans nigra). Getting the ID right matters — you don't want to remove a native tree, and you don't want to spare the invasive.

Leaf Structure: Compound Pinnate with a Key Gland

Tree of heaven has alternate, compound pinnate leaves ranging from 1 to 4 feet long. Each leaf contains 11 to 41 leaflets arranged in opposite pairs with a single terminal leaflet.

The single most reliable identification feature: Each leaflet has 1–2 rounded lobes at its base (near the stem), and each lobe has a small, round gland on its underside. No native look-alike has this combination. Run your finger along the base of the leaflet — you'll feel small bumps. These basal glands are present year-round.

The Smell Test

Crush a leaf or snap a small twig. Tree of heaven produces a distinctive pungent, unpleasant odor variously described as burnt peanut butter, cat urine, or rancid cashews. This smell is caused by ailanthone and related compounds. Native sumac smells mildly astringent; black walnut smells strongly of walnut husks. Neither smells like TOH.

Bark and Stem

Young stems: smooth, tan to gray-green, often with pale lenticels (small horizontal pores)
Mature bark: light gray, longitudinally furrowed with interlacing lighter ridges — often described as resembling cantaloupe skin
Stems are thick and pithy inside when cut; cross-sections show a tan, spongy pith distinct from the harder wood of native trees

Seeds and Fruit Clusters

TOH produces samaras — papery, single-winged seeds in large clusters. Clusters are rusty red to tan when mature (September–November) and persist on the tree into winter, making winter ID easy. Each samara is twisted, approximately 1.5 inches long, with the seed in the center.

Growth Form and Habit

Grows extremely fast — 6–10 feet per year from root sprouts
Common in disturbed soils: roadsides, fence lines, railroad rights-of-way, vacant lots, forest edges
Forms dense thickets from root sprouts around a parent tree
In forests: grows in full sun in openings; rarely survives in deep shade

Quick Comparison Table: TOH vs. Look-Alikes

|---|---|---|---|

| Leaflet base glands | Yes (diagnostic) | No | No |

Why You Can't Just Cut It Down

Tree of heaven is one of the most vigorous resprouting plants in North American ecology. A mature tree cut at the stump will typically produce 10–20 root sprouts within weeks. These sprouts grow faster than the original tree because they are supported by an established root system that may extend 30+ feet from the trunk.

Additionally, TOH produces allelopathic chemicals (ailanthone) that suppress competing vegetation, keeping the surrounding area open for its own resprouts. Simply cutting creates a clearing and an explosion of new shoots — effectively making the problem worse.

The rule: Any removal method that does not kill the root system is temporary at best and counterproductive at worst.

Removal Methods That Actually Work

Method 1: Foliar Spray (Best for Small Trees, Sprouts, and Thickets)

Best for: Trees under 15 feet tall; root sprout thickets; areas where stump treatment is impractical Herbicides: Triclopyr (Garlon 3A, Ortho Brush-B-Gon) or glyphosate (Roundup Concentrate). Triclopyr is generally preferred for TOH because it is more effective on woody plants and breaks down more quickly in soil. Method:

Apply foliar spray in late summer (August–September) when the tree is actively moving sugars down to roots — this maximizes herbicide translocation.
Spray to the point of drip, covering all leaf surfaces. Use a backpack sprayer for thickets.
Expect crown dieback within 2–4 weeks. Roots will attempt resprouting the following spring — retreatment of any resprouts is necessary.

Important: Do not spray near water bodies. Apply on a calm day to prevent drift. Follow all label directions.

Method 2: Cut-Stump Treatment (Best for Medium to Large Trees)

Best for: Trees too large for foliar spray; individual trees where surrounding vegetation must be protected Herbicides: Concentrated triclopyr (Garlon 4A, 25% solution in bark oil penetrant) or glyphosate (50% solution in water with surfactant) Method:

Cut the tree at a convenient height (knee to waist height) using a chainsaw or handsaw.
Immediately (within 60–90 seconds of cutting) paint the entire cut surface with herbicide concentrate using a foam brush or dauber. Speed is critical — the cambium layer closes within minutes.
Do not delay treatment to clean up brush first. Treat the stump, then clean up.
Mark treated stumps with flagging tape; monitor for resprouts monthly for 2 years.
Resprouts: treat immediately with cut-stump or foliar method.

Method 3: Basal Bark Treatment (Best for Trees 6 Inches Diameter and Under; No Cutting Required)

Best for: Smaller trees in areas where cutting is impractical; treating without a saw Herbicide: Triclopyr in bark penetrant oil (Garlon 4A at 20–25% in basal bark oil or Pathfinder II ready-to-use) Method:

Mix triclopyr ester in commercial basal bark oil (not water — the oil penetrates bark).
Spray or paint the lower 12–18 inches of bark, all the way around the trunk, until thoroughly wet.
No cutting required. Herbicide penetrates through bark to the cambium.
Best applied in fall through early spring when foliage is absent. Avoid when bark is soaking wet.

Method 4: The "Hack-and-Squirt" (Girdle and Treat)

Best for: Large trees in sensitive areas where felling is not practical Method:

Make a series of downward cuts (hacks) with a hatchet or chisel into the bark, forming a ring around the tree at waist height. Cuts should penetrate to the cambium — typically 1/2 to 1 inch deep.
Immediately inject or squirt concentrated triclopyr (25% solution) or glyphosate (50% solution) into each cut.
Spacing: cuts approximately 1–2 inches apart all the way around; cuts overlap to ensure complete ring treatment.
Tree will die over 2–6 weeks. Leave standing (snags provide wildlife habitat) or fell once dead.

The "Trap Tree" Strategy: Turn TOH Against SLF

Instead of immediately removing all tree of heaven, a trap tree strategy converts a TOH into a killing station:

Identify one or two large TOH on the property (ideally the most SLF-attractive trees, typically those with the heaviest prior infestation).
Treat with dinotefuran trunk band in late June when SLF adults and 4th instars are present (see How to Kill Spotted Lanternfly).
SLF are attracted to the TOH as normal but ingest lethal doses of systemic insecticide while feeding.
Then treat the TOH itself for removal in late August after peak SLF feeding season, using cut-stump or basal bark method.

This approach maximizes killing during the summer then eliminates the host before the next spring. It is particularly effective for properties with large, established TOH trees where immediate removal would be logistically difficult.

Native Tree Alternatives: What to Plant Instead

After removing TOH, replant with native species that provide equivalent ecosystem services without supporting invasive pest populations. Recommended by region:

Mid-Atlantic (DC, MD, VA, PA, NJ, NY)

| Native Tree | Notes |

|---|---|

| Tulip poplar (Liriodendron tulipifera) | Fast-growing, large canopy; excellent pollinator value |

| Red maple (Acer rubrum) | Adaptable; good fall color; note: SLF does feed on red maple, but it is far less preferred than TOH |

| Persimmon (Diospyros virginiana) | Drought-tolerant; wildlife food source |

| Serviceberry (Amelanchier spp.) | Spring bloom; bird food; understory or small tree |

| Sycamore (Platanus occidentalis) | Streamside planting; large canopy; very fast-growing |

| Blackgum / Black tupelo (Nyssa sylvatica) | Outstanding fall color; wildlife value; not SLF-preferred |

| Eastern redbud (Cercis canadensis) | Small ornamental tree; excellent early pollinator food |

Consult the Chesapeake Bay Native Plant Center or your state's native plant society for locally sourced nursery stock.

Disposal of Cut Material

Fresh-cut TOH branches, trunk sections, and root material can resprout if left on moist ground. Proper disposal:

Chip or shred branches (chips do not resprout)
Dry cut sections on a tarp for 2–4 weeks before chipping or burning
Do not compost untreated fresh material
Do not leave root sections exposed on damp soil

Key Sources

Ding, J. et al. (2006). "Ailanthus altissima: Invasion biology and management." Biological Invasions.
Penn State Extension. (2024). "Tree of Heaven Identification and Control." extension.psu.edu.
Virginia Department of Forestry. (2023). "Tree of Heaven Control Methods for Landowners."
Gallagher, F. (2023). "Host plant use by spotted lanternfly in New Jersey." Rutgers NJAES Research Report.
USDA Forest Service. (2024). "Best Management Practices: Tree of Heaven and Spotted Lanternfly." FS-1177.

Internal linking: Link "spotted lanternfly" and "SLF" references to `/spotted-lanternfly-season-2026`, "dinotefuran" treatment to `/how-to-kill-spotted-lanternfly`, "trap tree strategy" to `/how-to-kill-spotted-lanternfly`.