Spotted Gum Tree in Adamstown Heights Struck by Lightning

Understanding the Impact of Lightning Strikes on Trees

Approximately six months ago, an extraordinary event occurred when lightning struck a magnificent Spotted Gum (Corymbia maculata) located in Adamstown Heights. In the immediate aftermath, the customer swiftly contacted Waratah Professional Tree Care, where our highly skilled senior arborist, Steve, promptly arrived on-site. He performed a thorough assessment of the damage and executed a remedial pruning procedure aimed at enhancing the tree’s chances for recovery. The entry and exit wounds from the lightning strike were strikingly visible, while a nearby tree suffered catastrophic damage, losing its entire foliage as a result of the immense force of the lightning strike.

The customer observed a significant decline in the tree's health following the strike. Consequently, they requested Steve's return for a follow-up evaluation of the tree's recovery potential in light of the incident.

What Are the Detrimental Effects 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 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.

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, usually 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 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. This loss critically undermines the structural integrity of the tree.

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

What Are the Prognosis and Future Prospects for This Tree?

The extent of damage sustained by the tree 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:

• Implement Immediate Safety Measures: It is vital 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 substantial deadwood present in the canopy poses a falling hazard and requires prompt attention.
• Maintain 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.
• Conduct 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.

Should You Be Concerned About Lightning Strikes Impacting 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. Spotted Gums, like many eucalyptus species, are particularly conductive due to their moisture content and height.

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.

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 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.

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 instances, split wood or shattered branches. The presence of Lichtenberg figure burn patterns on the bark is a definitive indicator.

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.

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. Avoid attempting to assess the structural damage yourself, as internal damage may not always be visible from the outside.

If you have a tree that you are concerned about after 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.