Spotted Gum Tree Hit by Lightning in Adamstown Heights

Exploring the Effects of Lightning Strikes on Trees

About six months ago, an extraordinary event transpired when lightning struck a magnificent Spotted Gum (Corymbia maculata) in Adamstown Heights. In the aftermath, the client promptly reached out to Waratah Professional Tree Care for assistance. Our expert senior arborist, Steve, quickly arrived to conduct a comprehensive assessment of the damage caused by this incident. He executed a remedial prune, aimed at improving the tree's likelihood of recovering. The entry and exit wounds created by the lightning strike were clearly visible, while a nearby tree suffered catastrophic damage, losing all its foliage due to the sheer force of the strike.

The customer indicated a marked decline in the tree's health, prompting a request for Steve to return and evaluate the tree's capacity for recovery following the incident. This ongoing concern underscores the critical importance of professional evaluation in managing tree health after such traumatic events, ensuring that the tree receives the appropriate care it requires.

What Are the Implications of Lightning Strikes on Trees?

The charred electrical patterns, referred to as Lichtenberg figures, were prominently visible on the bark of the trunk, clearly marking the path of the lightning. Both the entry wound, where the lightning made contact, and the exit wound, where it earthed, were apparent and unmistakable, indicating the severity of this incident.

Lightning does not merely scorch the outer bark of a tree; the internal damage it inflicts can be significantly more severe and far-reaching, impacting the tree's overall health and structural integrity. The repercussions extend beyond mere surface wounds, potentially leading to long-term consequences for the affected tree.

When a bolt of lightning strikes a tree, the immense electrical charge travels through the tree, seeking the path of least resistance to the ground, typically through the water-conducting tissue located just beneath the bark. The heat produced is extreme and instantaneous, effectively boiling the sap within the cambium layer, which is the 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, critically undermining the structural integrity of the tree. This process can lead to a slow decline in health, making it crucial to monitor the tree's condition closely.

The tree does not die immediately after the strike, which is why the decline may take weeks or even months to manifest visibly. The particular Spotted Gum displays some regrowth, suggesting that it is still fighting to survive. However, the overall prognosis remains uncertain and cautious, emphasising the importance of ongoing monitoring and care to assess its recovery potential.

What Are the Prospects for the Future of This Tree?

The extent of damage the tree sustained heavily relies on how much of the cambium layer was destroyed and whether the root system also suffered from the earthing strike. Understanding these factors is crucial for determining the tree's future viability and health.

Steve’s assessment revealed several urgent priorities that must be addressed:

• Immediate safety measures: It is vital to continuously monitor the structural integrity of the tree. A tree that has been struck by lightning may appear stable while being severely weakened internally. Any substantial deadwood present in the canopy poses a falling hazard and requires prompt attention to ensure safety for nearby individuals and property.
• 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 care to prevent further damage. Regular inspections can help identify any signs of infestation or disease early.
• 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 hope for recovery. Conversely, if it stalls, removal may ultimately be the safest option to mitigate further risk to surrounding structures and individuals.

Should You Be Concerned About the Impact of Lightning Strikes on Your Trees?

While lightning strikes are relatively rare, they are not as infrequent as many might assume. Tall, isolated trees and those located 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 susceptible to lightning strikes and the severe damage that can ensue.

If you observe a sudden or unexplained decline in a tree's health, especially following a storm, it is advisable 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, ensuring safety for your property and the surrounding environment.

Comprehensive Case Study Analysis

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, showcasing our commitment to quality and environmentally responsible practices in tree care and management.

Frequently Asked Questions 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 necessary interventions to aid recovery.

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 is a definitive indicator of lightning damage, and should be addressed promptly.

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 showing 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 for people and property in the vicinity.

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 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, and professional expertise is essential in these situations to ensure accurate evaluation and safety.

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 for expert assistance and guidance.