Spotted Gum Tree Hit by Lightning in Adamstown Heights

Exploring the Effects of Lightning Strikes on Trees

Approximately six months ago, a dramatic incident took place when lightning struck a remarkable Spotted Gum (Corymbia maculata) situated in Adamstown Heights. Following this significant event, the customer promptly reached out to Waratah Professional Tree Care. Our experienced senior arborist, Steve, swiftly arrived on-site to carry out a comprehensive evaluation of the damage sustained. He executed a remedial prune intended to bolster the tree’s chances of recovery. The entry and exit wounds from the lightning strike were strikingly visible, while a neighbouring tree endured severe damage, losing all its foliage as a result of the overwhelming force of the lightning strike.

The customer observed a discernible decline in the tree's health, prompting a request for Steve to return and reassess the tree's recovery potential after the incident. This ongoing concern underscores the crucial role of professional evaluation in managing tree health following such traumatic events.

What Are the Effects of Lightning Strikes on Trees?

The charred electrical patterns, known as Lichtenberg figures, were prominently displayed on the bark of the trunk, clearly marking the path of the lightning. Both the entry wound, where the lightning struck, and the exit wound, where it earthed, were evident and unmistakable, illustrating the severity of the incident.

Lightning does not merely scorch the outer bark of a tree; the internal damage it causes can be significantly more severe and extensive, adversely affecting the tree's overall health and structural integrity.

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, generally 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 the thin band of living cells responsible 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 capacity to transport sugars from the leaves down to the roots and water from the roots to the leafy canopy. The affected cells perish, growth ceases, and overall vitality diminishes, critically undermining the structural integrity of the tree.

The tree does not die immediately following the strike, which is why the decline may take weeks or even months to become visibly apparent. The particular Spotted Gum exhibits some regrowth, suggesting that it is still striving to survive. However, the overall prognosis remains uncertain and cautious, underscoring the importance of continuous monitoring and care.

What Are the Future Prospects for This Tree?

The extent of damage the tree has sustained heavily depends on how much of the cambium layer was destroyed and whether the root system also suffered from the earthing strike. Understanding these elements is crucial for assessing the tree's future.

Steve’s assessment identified several urgent priorities that must be addressed:

• Immediate safety measures: It is essential 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 necessitates prompt attention to ensure safety.
• Vigilance for secondary infections: The wounds inflicted by a lightning strike can act as entry points for fungal diseases and wood-boring insects. A compromised tree is a vulnerable tree that requires close observation and care to prevent further damage.
• 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 to surrounding structures and individuals.

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 positioned near water are statistically at a higher risk of being struck. Spotted Gums, similar to many eucalyptus species, are particularly conductive due to their moisture content and height, rendering them more susceptible to lightning strikes.

If you notice a sudden or unexplained decline in a tree, especially following a storm, it is wise to have an arborist evaluate it without delay. Early intervention offers the tree the best chance for recovery and protects you from the dangers associated with a compromised tree that goes undetected, ensuring safety for your property and the surrounding environment.

In-Depth Overview 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, illustrating our commitment to quality and environmentally responsible practices.

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 crucial for determining the prognosis and necessary interventions.

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 sign of lightning damage.

Is a tree that has been struck by lightning dangerous?
Yes, it can be. A tree that has experienced significant internal damage from a lightning strike may fail structurally without exhibiting obvious external signs of distress. If you suspect lightning damage, it is imperative to have the tree assessed by a qualified arborist promptly to ensure safety for people and property.

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 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, and professional expertise is essential in these 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 for expert assistance.