Spotted Gum Tree Struck by Lightning in Adamstown Heights

Evaluating the Consequences of Lightning Strikes on Trees

Approximately six months ago, an extraordinary incident occurred when a bolt of lightning struck a remarkable Spotted Gum (Corymbia maculata) situated in Adamstown Heights. The homeowner, who witnessed this spectacular event, promptly reached out to Waratah Professional Tree Care. Our experienced senior arborist, Steve, arrived swiftly to assess the damage. He performed a thorough evaluation of the tree’s condition and executed a remedial prune, significantly boosting the tree's chances of recovery. The entry and exit wounds from the lightning strike were clearly visible, while the nearby tree suffered extensive damage, losing all foliage as a result of the tremendous force of the lightning.

The homeowner noticed a significant decline in the tree's health and subsequently requested Steve to return for a follow-up assessment, aiming to evaluate the tree's potential for recovery following the lightning incident.

What Are the Effects of Lightning Strikes on Trees?

The charred electrical patterns, commonly referred to as Lichtenberg figures, were prominently visible on the bark of the trunk, marking the path of the lightning strike. Both the entry wound, where the lightning made contact, and the exit wound, where it returned to the ground, served as clear indicators of the strike's severity.

Lightning does not merely singe the outer bark of a tree; the internal damage it inflicts can often be significantly more severe and widespread.

When a bolt of lightning strikes a tree, the immense electrical charge travels through the tree, seeking the path of least resistance as it makes its way to the ground, typically following the water-conducting tissue situated just beneath the bark. The heat generated during this process is extreme and instantaneous, effectively boiling the sap within the cambium layer, which is comprised of a thin band of living cells responsible for the tree's growth and the transport of essential nutrients and water throughout the entire structure.

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 up to the leafy canopy. The affected cells perish, growth comes to a halt, and overall vitality diminishes. This loss critically undermines the tree’s structural integrity, making it a potential hazard to its surroundings.

Interestingly, the tree does not die immediately; this is why the decline may take weeks or even months to become visually apparent. This particular Spotted Gum displays some signs of regrowth, suggesting that it is still struggling for survival. However, the overall prognosis remains uncertain, requiring careful and ongoing monitoring.

What Are the Chances for Recovery of This Tree?

The degree of damage the tree sustained largely depends on how much of the cambium layer was destroyed and whether the root system also suffered from the earthing strike.

Steve’s assessment highlighted several urgent priorities:

• 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 significant deadwood present in the canopy poses a falling hazard and requires prompt attention to ensure the safety of 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 and protect its health.
• Regular evaluations: The amount of regrowth observed in the upcoming months will yield 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 individuals.

Should You Be Worried About Lightning Strikes Affecting Your Trees?

While lightning strikes are relatively rare occurrences, they are not as infrequent as many might assume. 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 impressive height, rendering them more susceptible to lightning strikes.

If you notice a sudden or unexplained decline in a tree, particularly following a storm, it is wise to have an arborist evaluate it sooner rather than later. Early intervention provides the tree with the best chance for recovery and protects you from the dangers associated with a compromised tree that goes undetected, which can pose significant risks to people and property.

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 throughout 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, 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 relies 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 crucial for determining the prognosis and the appropriate care required for the tree.

How can I tell if my tree has been struck by lightning?
Watch 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 considerable internal damage from a lightning strike may fail structurally without displaying obvious external signs of distress. If you suspect lightning damage, it is vital to have the tree assessed by a qualified arborist without delay to ensure safety for everyone around.

What should I do if I think my tree has been struck by lightning?
Keep people and pets away 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.