Spotted Gum Tree Lightning Strike: Insights from Adamstown Heights

Understanding the Consequences of Lightning Strikes on Trees

About six months ago, a dramatic event occurred when lightning struck a remarkable Spotted Gum (Corymbia maculata) in Adamstown Heights. The customer, having witnessed this astonishing phenomenon, immediately reached out to Waratah Professional Tree Care. Our experienced senior arborist, Steve, responded promptly to assess the situation. He carried out a thorough evaluation of the damage and performed a necessary remedial prune, greatly improving 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 its foliage due to the tremendous 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 recovery potential following the incident.

What Are the Effects of Lightning Strikes on Trees?

The charred electrical patterns, known as Lichtenberg figures, were prominently visible on the bark of the trunk, serving as clear indicators of the lightning strike. Both the entry wound, where the lightning made contact, and the exit wound, where it earthed, were unmistakable marks of the event.

Lightning does not merely scorch the outer bark of a tree; the internal damage it causes can often be far more severe and extensive than one might initially realise.

When lightning strikes a tree, the immense electrical charge travels through the tree, seeking the path of least resistance to the ground, typically passing through the water-conducting tissue just beneath the bark. The heat generated is extreme and instantaneous, effectively boiling the sap within the cambium layer, which is a thin layer of living cells crucial for the tree's growth and the transport of essential nutrients and water throughout the structure.

Once the cambium layer is compromised, the tree loses its vital ability to transport sugars from the leaves to the roots and water from the roots to the leafy canopy. The affected cells die, growth halts, and overall vitality declines significantly. This loss severely undermines the structural integrity of the tree, making it a potential hazard for nearby structures and individuals.

The tree does not die immediately, which is why the decline may take weeks or even months to become apparent. This particular Spotted Gum shows some signs of regrowth, indicating that it is still fighting for survival. However, the overall prognosis remains uncertain, demanding vigilant ongoing monitoring.

What Are the Chances of Recovery 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 experienced damage from the earthing strike.

Steve’s assessment revealed several urgent priorities:

• Immediate safety measures: Monitoring the structural integrity of the tree is crucial. A tree that has been struck by lightning may appear stable externally while being severely weakened internally. Any significant deadwood in the canopy poses a falling hazard and requires prompt attention to ensure safety for those nearby.
• Vigilance for secondary infections: The wounds inflicted by a lightning strike can become entry points for fungal diseases and wood-boring insects. A compromised tree is a vulnerable tree, necessitating close observation and ongoing care to prevent further decline and potential hazards.
• Regular evaluations: The level of regrowth observed in the coming months will provide valuable insights into the tree’s long-term prognosis. If the regrowth is vigorous and continues, there may be potential for recovery. Conversely, if it stalls, removal may ultimately be the safest option to mitigate further risks to surrounding structures and individuals.

Should You Worry About Lightning Strikes Affecting Your Trees?

While lightning strikes are relatively rare occurrences, they are not as infrequent as many people 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 high moisture content and impressive height, making them more prone to lightning strikes.

If you observe a sudden or unexplained decline in a tree, particularly after a storm, it is wise to have an arborist evaluate it sooner rather than later. Early intervention provides the tree with the greatest chance for recovery while protecting you from the dangers associated with a compromised tree that goes undetected, which can pose serious risks to both 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 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 limited 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 to determine the prognosis and appropriate care.

How can I recognise 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 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 everyone.

What steps 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 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, which could lead to dangerous situations.

If you have a tree that causes you concern 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.