Lightning Strikes Spotted Gum Tree in Adamstown Heights

Comprehensive Evaluation of Lightning Strikes on Trees

Approximately six months ago, a dramatic incident occurred when lightning struck an impressive Spotted Gum (Corymbia maculata) located in Adamstown Heights. The customer, who witnessed this extraordinary event, immediately contacted Waratah Professional Tree Care for assistance. Our experienced senior arborist, Steve, arrived promptly to assess the situation. He undertook a thorough evaluation of the damage sustained and performed a remedial prune, significantly improving the tree's chances of recovery. The entry and exit wounds from the lightning strike were clearly visible, while the neighbouring tree experienced severe damage, losing all its foliage as a result of the immense force of the lightning.

The customer noted a significant decline in the health of the tree and subsequently requested Steve to return for a follow-up assessment to determine the tree's potential for recovery after the incident.

What Are the Consequences of Lightning Strikes on Trees?

The charred electrical patterns, referred to 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, served as clear indicators of the lightning strike's impact.

Lightning does not merely scorch the outer bark of a tree; the internal damage it inflicts can often be far more severe and extensive. When a bolt of lightning strikes a tree, the massive 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 consists of a thin band of living cells vital 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 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, transforming it into a potential hazard.

The tree does not die immediately, which is why the decline may take weeks or even months to manifest visibly. This particular Spotted Gum displays some regrowth, hinting that it is still struggling to survive. However, the overall prognosis remains uncertain and cautious, necessitating ongoing monitoring and care.

What Are the Chances of Recovery for This Tree?

The degree of damage the tree sustained 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 highlighted 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 surrounding areas.
• 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, necessitating close observation and ongoing care to prevent further decline and protect tree health.
• Regular evaluations: The amount of regrowth observed in the coming months will provide critical insights into the tree’s long-term prognosis. If the regrowth is robust 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 events, 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, along with 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 remains undetected, which can pose serious 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 offering 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 before the strike, and the extent of damage to the conducting tissue. An evaluation by an arborist is essential for determining the prognosis and necessary care.

How can I determine 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 hazardous?
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 for all.

What steps should I take if I suspect my tree has been struck by lightning?
Ensure that individuals 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 you are concerned about following storm damage or a lightning strike, Waratah Professional Tree Care offers onsite assessments across Newcastle and the Hunter Region starting from $110.
Contact us at (02) 4956 6602.