07/03/2026
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Identifying and Removing the "Tree of Heaven" 🌳
Have you noticed a fast-growing tree forming dense thickets in your neighborhood? It might be Ailanthus altissima, commonly known as the Tree of Heaven—but don't let the name fool you. This invasive species is a formidable opponent for our local ecosystem.
🔍 How to ID it:
• Size: Can skyrocket to over 25 meters (80+ feet) tall.
• Leaves: Look for a "notch" or serrated edge near the base of each leaflet.
• The Smell Test: If you crush the leaves, they emit a distinct, unpleasant odor often described as "rancid peanut butter."
⚠️ Why it’s a problem:
1. Chemical Warfare: It releases allelopathic chemicals that prevent other plants from growing nearby.
2. Structural Damage: Its aggressive root systems can crack building foundations and wreck sewer lines.
3. Prophylactic Spreader: A single female tree can produce 325,000 seeds a year, and it resprouts vigorously from even tiny root fragments.
🛡️ How to fight back:
Because this tree is so resilient, manual pulling only works for very small, young saplings. For established trees, a strategic approach is required:
• The "Cut and Dab" Method: Cut the biomass down and immediately (within minutes!) apply an herbicide containing triclopyr (such as "Turbodor") directly to the stump.
• Timing is Everything: For large stands, applying herbicide in early autumn is most effective, as the tree is pulling nutrients down into its roots for dormancy.
• Persistence: Expect "suckers" or shoots to pop up in response to cutting. You must repeat the treatment until the root system is exhausted.
🍎 Why it matters for the Western Cape:
Beyond the local damage, this tree is the preferred host for the Spotted Lanternfly. This invasive insect is moving fast and could be devastating to our agricultural sector, especially our world-renowned vineyards and orchards.
Protect our land. Identify it. Eradicate it.
