Lightning Strikes in Adamstown Heights: A Spotted Gum Case Study

Understanding the Impact of Lightning Strikes on Trees

Approximately six months ago, a dramatic event occurred when lightning struck a remarkable Spotted Gum (Corymbia maculata) located in Adamstown Heights. Following this incident, the customer swiftly contacted Waratah Professional Tree Care. Our senior arborist, Steve, promptly arrived on-site to perform an extensive evaluation of the damage. He executed a remedial prune aimed at significantly enhancing the tree’s chances of recovery. Notably, the entry and exit wounds from the lightning strike were clearly visible, while the adjacent tree suffered severe damage, losing all its foliage due to the overwhelming force of the lightning strike.

The customer reported a significant decline in the tree's health, prompting them to request a follow-up assessment from Steve to evaluate the tree's potential for recovery after this distressing event.

What Are the Consequences of Lightning Strikes on Trees?

The charred electrical patterns, referred to as Lichtenberg figures, were prominently displayed on the bark of the trunk. Both the entry wound, where the lightning initially struck, and the exit wound, where it dispersed into the ground, were clearly discernible and unmistakable.

Lightning does not merely scorch the outer bark of a tree; the internal damage it inflicts can be significantly more severe and far-reaching than many might assume. The immediate impact on the tree's health and structural integrity can be profound.

When a bolt of lightning strikes a tree, the immense electrical charge travels through the tree, instinctively seeking the path of least resistance to the ground, typically through the water-conducting tissue situated just beneath the bark. The heat generated by this process is extreme and instantaneous, effectively boiling the sap within the cambium layer, the thin band of living cells responsible for the tree's growth alongside the transport of vital nutrients and water throughout the tree.

Once the cambium layer faces compromise, the tree loses its ability to transport sugars from its leaves down to its roots and water from the roots to the leafy canopy. The affected cells perish, halting growth and diminishing overall vitality. This critical loss undermines the structural integrity of the tree, making it more susceptible to further damage or disease.

Although the tree does not die immediately, the decline may take weeks or even months to become visibly apparent. This particular Spotted Gum shows some signs of regrowth, indicating that it is still struggling to survive. However, the overall prognosis remains uncertain, necessitating cautious monitoring and care.

What Are the Future Prospects for This Tree?

The extent of damage that the tree sustained is heavily dependent on how much of the cambium layer was destroyed, as well as whether the root system suffered from the earthing strike.

Steve’s assessment revealed several urgent priorities that require immediate attention:

• Immediate safety measures: It is crucial to monitor the structural integrity of the tree. A tree that has endured a lightning strike might appear stable while being severely weakened internally. Any substantial deadwood present in the canopy poses a risk of falling and requires prompt attention to ensure public safety.
• Vigilance for secondary infections: The wounds created by a lightning strike can become entry points for fungal diseases and wood-boring insects. A compromised tree is a vulnerable tree that necessitates diligent observation and care to prevent further deterioration.
• Regular evaluations: The amount of regrowth observed in the months to come will provide valuable insights into the tree’s long-term prognosis. If the regrowth is vigorous and continues, there is hope for recovery. Conversely, if growth stalls, removal may ultimately become the safest option to mitigate further risk.

Should You Be Alarmed About Lightning Strikes Affecting Your Trees?

While lightning strikes are relatively rare, they are not as infrequent as many believe. 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 height, making them more vulnerable during thunderstorms.

If you observe 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 provides the tree with the best chance for recovery and safeguards you from the dangers associated with a compromised tree that goes undetected.

Case Study Summary and Insights

This assessment was conducted by Steve Brown, senior arborist at Waratah Professional Tree Care. Waratah has been delivering arborist services throughout Newcastle and the Hunter Region since 1998. We proudly hold ISO 9001, ISO 14001, and ISO 45001 certifications through Global Compliance Certification, demonstrating our commitment to quality and environmental responsibility.

Frequently Asked Questions Regarding Lightning Strikes on Trees

Can a tree recover after being struck by lightning?
Yes, certain 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 is influenced by 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 best course of action.

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, 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 serves as a definitive indicator of a lightning strike's impact.

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 at a safe distance from the affected tree until it has been evaluated. Contact a qualified arborist as soon as possible. Avoid attempting to assess the structural damage yourself, as internal damage may not always be visible from the outside and requires professional expertise.

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