Spotted Gum Tree Hit by Lightning in Adamstown Heights

Exploring the Effects of Lightning Strikes on Trees

Nearly six months ago, a significant incident unfolded when a bolt of lightning struck a remarkable Spotted Gum (Corymbia maculata) located in Adamstown Heights. Following this event, the concerned customer immediately reached out to Waratah Professional Tree Care. Our experienced senior arborist, Steve, swiftly arrived to carry out a comprehensive assessment of the damage inflicted. He undertook a remedial pruning procedure aimed at improving the tree's chances of recovering from the strike. The entry and exit wounds from the lightning were clearly visible, while a neighbouring tree suffered extensive damage, losing all its foliage due to the sheer force of the lightning strike.

The customer observed a significant decline in the tree's overall health after the strike, prompting a request for Steve to return and reassess the tree's potential for recovery in the aftermath of the incident. This ongoing concern underscores the critical importance of professional evaluations in managing tree health following such traumatic events.

What Are the Impacts of Lightning Strikes on Tree Health?

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 initially struck, and the exit wound, where it earthed, were apparent and unmistakable, indicating the severity of the incident and its implications for the tree's health.

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 in profound ways.

When a bolt of lightning strikes a tree, the tremendous 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, as well as the transport of essential nutrients and water throughout the tree.

Once the cambium layer suffers damage, 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 and its future health.

The tree does not die immediately following 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 ensure the tree's health.

What Are the Prognosis and Future Prospects for 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 and its potential for recovery.

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

• Immediate safety measures: It is vital to continually 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 the safety of nearby individuals and structures.
• 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 and promote recovery.
• 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 Lightning Strikes Affecting Your Trees?

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

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 offers the tree the best chance for recovery and protects you from the dangers associated with a compromised tree that goes undetected, thereby ensuring safety for your property and the surrounding environment.

In-Depth Analysis 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, showcasing our commitment to quality and environmentally responsible practices in all our operations.

Frequently Asked Questions Regarding Lightning Strikes on Trees

Can a tree recover after being struck by lightning?
Yes, some trees can indeed 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 required 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 not be overlooked.

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, pets, and property.

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 of the tree's condition. 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 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 in managing tree health.