Spotted Gum Tree Hit by Lightning in Adamstown Heights: Insights

Assessing the Impact of Lightning Strikes on Trees

Approximately six months ago, a dramatic incident unfolded when lightning struck a remarkable Spotted Gum (Corymbia maculata) located in Adamstown Heights. The customer, having witnessed this astonishing event, promptly contacted Waratah Professional Tree Care. Our skilled senior arborist, Steve, arrived swiftly to evaluate the situation. He conducted a comprehensive assessment of the damage and performed a remedial prune, significantly enhancing the tree's chances of recovery. The entry and exit wounds from the lightning strike were clearly visible, while the neighbouring tree suffered severe damage, losing all its foliage due to the extraordinary force of the lightning.

The customer observed a marked decline in the tree's health and subsequently requested Steve to return for a follow-up assessment to evaluate the tree's potential for recovery following the incident.

What Are the Implications of Lightning Strikes on Trees?

The charred electrical patterns, known as Lichtenberg figures, were prominently visible, marking the bark of the trunk. Both the entry wound, where the lightning struck, and the exit wound, where it earthed, were apparent and unmistakable indicators of the strike.

Lightning does not merely scorch the outer bark of a tree; the internal damage it inflicts can be significantly more severe and extensive.

When a bolt of lightning strikes a tree, the immense electrical charge traverses through the tree, seeking the path of least resistance to the ground, typically travelling through the water-conducting tissue located just beneath the bark. The heat generated is extreme and instantaneous, effectively boiling the sap within the cambium layer, which consists of a thin band of living cells responsible for the tree's growth and the transport of essential nutrients and water throughout the tree.

Once the cambium layer is compromised, the tree loses its ability to transport sugars from the leaves down to the roots and water from the roots to the leafy canopy. The affected cells perish, growth halts, and overall vitality diminishes. This loss critically undermines the structural integrity of the tree, making it a potential hazard.

The tree does not die immediately, which is why the decline may take weeks or even months to manifest visibly. This particular Spotted Gum displays some regrowth, suggesting that it is still struggling to survive. However, the overall prognosis remains uncertain and cautious, requiring ongoing monitoring.

What Are the Prospects for Recovery of This Tree?

The extent of damage the tree sustained heavily depends on how much of the cambium layer was destroyed and whether the root system also suffered from the earthing strike.

Steve’s assessment revealed several urgent priorities:

• Immediate safety measures: It is crucial to monitor the structural integrity of the tree. A tree that has been struck by lightning may appear stable while being severely weakened internally. Any significant deadwood present in the canopy poses a falling hazard and requires prompt attention to ensure safety.
• Vigilance for secondary infections: The wounds created by a lightning strike can serve as entry points for fungal diseases and wood-boring insects. A compromised tree is a vulnerable tree that necessitates close observation and ongoing care to prevent further decline.
• Regular evaluations: The amount of regrowth observed in the coming months will provide valuable insights into the tree’s long-term prognosis. If the regrowth is robust and continues, there is potential for recovery. Conversely, if it stalls, removal may ultimately be the safest option to mitigate further risk to surrounding structures and people.

Should You Be Concerned About Lightning Strikes Affecting Your Trees?

While lightning strikes are relatively rare events, they are not as infrequent as many may think. Tall, isolated trees and those situated near water are statistically at a higher risk of being struck. Spotted Gums, like many eucalyptus species, are particularly conductive due to their moisture content and impressive height, making them more susceptible to lightning strikes.

If you notice a sudden or unexplained decline in a tree, especially following a storm, it is prudent to have an arborist evaluate it sooner rather than later. Early intervention offers the tree the best chance for recovery and protects you from the dangers associated with a compromised tree that goes undetected, which can pose serious risks to people and property.

Detailed Overview of the Case Study

This assessment was conducted by Steve Brown, senior arborist at Waratah Professional Tree Care. Waratah has been providing arborist services across Newcastle and the Hunter Region since 1998. We proudly hold ISO 9001, ISO 14001, and ISO 45001 certifications through Global Compliance Certification.

Common Queries Regarding Lightning Strikes on Trees

Can a tree recover after being struck by lightning?
Yes, some trees can recover from lightning strikes, particularly if the impact was a glancing blow and the damage to the cambium is limited to one side of the trunk. The potential for recovery hinges on the species, the tree's overall health prior to the strike, and the extent of damage to the conducting tissue. An evaluation by an arborist is essential for determining the prognosis and appropriate care.

How can I identify if my tree has been struck by lightning?
Look for signs such as bark that has been blown off or scorched in a spiral or vertical pattern down the trunk, visible entry and exit wounds, sudden dieback of the canopy in the weeks following a storm, and in some cases, split wood or shattered branches. The presence of Lichtenberg figure burn patterns on the bark is a definitive indicator of lightning damage.

Is a tree that has been struck by lightning dangerous?
Yes, it can be. A tree that has sustained significant internal damage from a lightning strike may fail structurally without displaying obvious external signs of distress. If you suspect lightning damage, it is crucial to have the tree assessed by a qualified arborist without delay to ensure safety.

What actions should I take if I suspect my tree has been struck by lightning?
Ensure that people and pets are kept away from the affected tree until it has been thoroughly evaluated. Contact a qualified arborist as soon as possible for a professional assessment. Avoid attempting to assess the structural damage yourself, as internal damage may not always be visible from the outside, which could lead to dangerous situations.

If you have a tree that you are concerned about following storm damage or a lightning strike, Waratah Professional Tree Care provides onsite assessments across Newcastle and the Hunter Region starting from $110.
Contact us at (02) 4956 6602.