Spotted Gum Tree Lightning Strike: Insights from Adamstown Heights

Understanding the Effects of Lightning Strikes on Trees

Approximately six months prior, a remarkable incident occurred when lightning struck a noteworthy Spotted Gum (Corymbia maculata) situated in Adamstown Heights. The customer, having witnessed this astonishing event, immediately contacted Waratah Professional Tree Care for professional assistance. Our experienced senior arborist, Steve, arrived promptly to evaluate the situation. He conducted a thorough assessment of the damage and performed a remedial prune, significantly increasing the tree's chances for recovery. The entry and exit wounds from the lightning strike were starkly visible, while an adjacent tree suffered severe damage, losing all its foliage due to the immense force of the lightning.

The customer noted a significant 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 after this unfortunate incident.

What Are the Consequences of Lightning Strikes on Trees?

The charred electrical patterns, recognised as Lichtenberg figures, were clearly visible on the bark of the trunk, marking the point of impact. Both the entry wound, where the lightning struck, and the exit wound, where it earthed, were unmistakable signs of the strike's effect.

Lightning does not merely scorch the outer bark of a tree; the internal damage it causes can be considerably more severe and extensive than it appears. When a bolt of lightning strikes a tree, the vast electrical charge travels through the tree, seeking the path of least resistance to the ground, typically moving through the water-conducting tissue located just beneath the bark. The heat generated is both extreme and instantaneous, effectively boiling the sap within the cambium layer, which consists of a delicate band of living cells that are essential for the tree's growth and the transportation of crucial 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 above. The affected cells perish, growth halts, and overall vitality diminishes. This loss severely undermines the structural integrity of the tree, rendering it a potential hazard to its surroundings.

The tree does not die immediately; hence, the decline may take several weeks or even months to manifest visibly. This particular Spotted Gum displays some signs of regrowth, suggesting it is still fighting to survive. However, the overall prognosis remains uncertain and cautious, necessitating ongoing monitoring and care.

What Are the Chances for Recovery of This Tree?

The degree of damage the tree sustained largely depends on the extent of the cambium layer that 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 for those nearby.
• Vigilance for secondary infections: The wounds created by a lightning strike can provide 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 inspections can help catch problems early.
• Regular evaluations: The amount of regrowth observed in the coming months will offer valuable insights into the tree’s long-term prognosis. If the regrowth is vigorous 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 Impacting Your Trees?

While lightning strikes are relatively rare events, they occur more frequently than many might believe. 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 impressive 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 wise to have an arborist assess it swiftly. Early intervention provides the tree with the best chance for recovery and protects you from the dangers associated with a compromised tree that goes unnoticed, which can pose serious risks to people and property.

Comprehensive Overview of the Case Study

This assessment was conducted by Steve Brown, senior arborist at Waratah Professional Tree Care. Waratah has been delivering 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.

Frequently Asked Questions About 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 confined to one side of the trunk. The potential for recovery depends 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 at a safe distance 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, potentially leading 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.