As a homeowner, you may have seen countless trees in your neighborhood with the upper canopy (the crown) sheared off, leaving an awkward trunk with little to no upper foliage. You may have asked yourself, “What is the purpose?” and “Should I consider this method for my trees?” In this guide, we’ll explore the downsides of topping, alternative pruning methods, and how pollarding is used to preserve the tree’s health.
What is Topping?
Topping is a method where the upper branches or canopy of a tree are indiscriminately cut back to reduce its height and size. This method often includes shearing branches of the crown straight off and not back to a branch collar, forming large, ugly stubs. This is usually performed for quick, short-term solutions such as risk reduction, utility line clearance, and view enhancement. However, people are often unaware of the long-term consequences of this practice.
Understanding the Risks: Why Topping Trees Comes with Consequences
Topping can be detrimental to the health of a tree for multiple reasons. First, a topping cut exposes the tree to diseases and infestations. When a sheer cut is performed well past a branch collar, the tree will be unable to close off this wound through a method known as compartmentalization. After this happens, exposed tissue is susceptible to decay, which over time allows diseases and insects to deteriorate the tree’s health. Secondly, topping results in an abundant loss of foliage. Trees obtain their energy through photosynthesis in the leaves. After a sheer cut is done on the canopy, the tree’s ability to generate energy is severely compromised. Lastly, topping causes the tree an immense amount of stress. As a result, an outburst of quickly-grown branches, known as water sprouts, is generated to try and compensate for the loss. These tend to be weakly attached and often grow vertically, causing the upper canopy to appear awkward and unstable.
A Safe Alternative
Several pruning techniques aim to maintain the health, structure, and natural form of the tree while addressing specific concerns. First, selective pruning targets specific branches that pose a risk or contribute to structural problems, such as crossing and rubbing branches, weak attachments, or diseased limbs. By carefully evaluating the tree’s structure and health, arborists can remove problem branches while preserving the integrity of the tree. Another safe practice is thinning. Thinning involves selectively removing smaller branches throughout the canopy to improve air circulation, reduce wind resistance, and allow more sunlight to penetrate the interior of the tree. Thinning cuts are made to reduce density without altering the tree’s overall shape.
Renewing Growth: Rescuing Topped Trees with the Pollarding Method
After a tree has been topped, restoring the canopy’s health is essential for safe, long-term growth. Canopy restoration pruning specifications can vary quite a bit depending on the tree species, age of the tree, and the type of damage that has occurred. Some canopy restoration may involve a series of structural pruning cuts by ways of thinning, and subordination, while others may shift into a more aggressive or high maintenance style of pruning such as pollarding. Pollarding is one of the pruning techniques that can be used to combat the effects of topping and is implemented by removing the epicormic growth of the tree to promote a dense growth of new shoots from the cut points. To the untrained eye, pollarding may look no different than “topping” but when implemented correctly and to the correct species of tree, this helps manage the size and shape of the tree and ensure its health and longevity. For trees that have been improperly topped, pollarding can be a valuable rescue strategy; by systematically cutting back to specific points, this helps to redirect the tree’s energy into producing wound wood, encouraging compartmentalization and thus preventing or limiting the decay that often results from topping. Pollarding, however, is usually not a one-time procedure. Pollarding requires regular maintenance to be effective and sustainable. Once the initial cuts are made to the tree, it needs to be revisited periodically, typically every 1-2 years, to remove new growth and maintain the desired size and shape. Without this ongoing care, the tree can develop weak, elongated branches that may be prone to breaking. Regular pollarding ensures the tree remains healthy, structurally sound, and aesthetically pleasing, preventing it from becoming overgrown and ensuring it fits well within its environment.
Conclusion
While tree topping might seem like a quick solution for managing a tree’s size and mitigating risks, its long-term consequences are overwhelmingly negative, leading to weakened trees susceptible to disease, decay, and structural instability. Understanding the detrimental effects of topping emphasizes the importance of adopting alternative pruning techniques such as selective pruning and thinning, which maintain the tree’s health and natural form. Furthermore, for trees already damaged by topping, pollarding offers a sustainable method to promote healthy regrowth and restore structural integrity. By prioritizing these better practices, we can ensure our trees remain robust, beautiful, and beneficial to the environment for years to come.
It is always important to consult with a certified arborist before making any impactful pruning decisions. Contact Barren Tree Solutions today to schedule an estimate with our ISA Certified Arborist.