Spotted Gum Tree Struck by Lightning: An Adamstown Heights Case Study

Understanding the Impact of Lightning Strikes on Trees

Approximately six months ago, a dramatic event unfolded when lightning struck a remarkable Spotted Gum (Corymbia maculata) located in Adamstown Heights. Following this shocking incident, the customer promptly contacted Waratah Professional Tree Care. Our seasoned senior arborist, Steve, promptly arrived on-site to perform a comprehensive evaluation of the damage inflicted. He executed a careful remedial pruning to significantly enhance the tree’s chances of recovery. The entry and exit wounds from the lightning strike were clearly visible, while a nearby tree suffered severe damage, losing all its foliage due to the overwhelming force of the lightning.

The customer reported a marked decline in the overall health of the tree. Consequently, they requested Steve to return for a follow-up assessment of the tree's potential for recovery in the aftermath of the incident.

What Are the Consequences of Lightning Strikes on Trees?

The charred electrical patterns, commonly referred to as Lichtenberg figures, were plainly visible, marking the bark of the trunk. Both the entry wound, where the lightning struck, and the exit wound, where it earthed, were apparent and unmistakable, indicating the path the lightning took through the tree.

Lightning does not merely scorch the outer bark of a tree; the internal damage it causes can be significantly more severe and far-reaching than one might initially think.

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, which typically occurs through the water-conducting tissue just beneath the bark. The heat generated is extreme and instantaneous, effectively boiling the sap within the cambium layer. This cambium layer consists of a thin band of living cells responsible for the tree's growth and the transportation of vital nutrients and water throughout its 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 to the leafy canopy. The affected cells die off, growth comes to a standstill, and overall vitality diminishes significantly. This loss critically undermines the tree’s structural integrity, making it more susceptible to further damage.

The tree does not die immediately, which is why the signs of decline may take weeks or even months to become visually apparent. This specific Spotted Gum displays some regrowth, suggesting that it is still struggling to survive. However, the overall prognosis remains uncertain and warrants cautious monitoring.

What Are the Future Prospects for This Tree?

The extent of damage the tree sustained depends significantly 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 essential to monitor the structural integrity of the tree closely. 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 removal to ensure safety.
• 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 entity that necessitates diligent monitoring and care to prevent additional health issues.
• Regular evaluations: The amount of regrowth observed in the forthcoming months will provide valuable insights into the tree’s long-term prognosis. If the regrowth is robust and continues steadily, there is hope for recovery. Conversely, if it stalls, removal may ultimately be the safest option to mitigate risks associated with a failing tree.

Should You Be Concerned About Lightning Strikes Affecting Your Trees?

While lightning strikes are relatively rare occurrences, they are not as infrequent as many might think. Tall, isolated trees, as well as those positioned near water, are statistically at a higher risk of being struck. Spotted Gums, akin to many eucalyptus species, are particularly conductive due to their moisture content and 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 evaluate it sooner rather than later. Early intervention offers the tree the best chance for recovery and protects you from potential dangers associated with a compromised tree that goes undetected.

Case Study Overview

This assessment was conducted by Steve Brown, senior arborist at Waratah Professional Tree Care. Waratah has been delivering arborist services throughout Newcastle and the Hunter Region since 1998. We proudly maintain ISO 9001, ISO 14001, and ISO 45001 certifications through Global Compliance Certification.

Common Inquiries Regarding 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 confined 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 indicators 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 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 properly 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 offers onsite assessments across Newcastle and the Hunter Region starting from $110.
Contact us at (02) 4956 6602.