Why Leaving Stubs Damages Trees

Incorrect pruning, particularly leaving branch stubs, can cause long-term damage to trees. While stub cuts may appear harmless, they interfere with a tree’s natural defence systems and significantly increase the risk of decay and structural failure.

Understanding why proper pruning technique matters helps protect tree health, safety and longevity.

Why Stub Cuts Are a Problem

• Prevent natural wound closure
• Disrupt the tree’s compartmentalisation process (CODIT)
• Create entry points for decay, pests and pathogens
• Often lead to weak epicormic regrowth and structural defects

When decay enters through a stub cut, it can spread inward toward the heartwood, reducing the tree’s structural integrity over time.

What Correct Pruning Looks Like

• Pruning cuts made just outside the branch collar
• Allows the tree to seal the wound effectively
• Minimises the spread of decay
• Supports long-term tree structure and health

Trees do not “heal” in the same way people do. Instead, they compartmentalise damage to limit decay. Incorrect pruning cuts interfere with this natural process.

Pruning Standards Matter

All pruning works should comply with AS 4373 – Pruning of Amenity Trees, ensuring cuts are made correctly and tree health is protected.

Qualified arborists understand tree biology — not just how to operate a chainsaw.