Trees add value to any property - but sometimes they become a liability. Knowing when to remove a tree versus when to leave it alone (or just prune it) isn't always obvious. Here are the most common signs we see that suggest a tree needs to come down.
1. Large dead branches in the canopy
Deadwood in a tree's canopy is a normal part of the tree's life cycle - but large dead branches (anything over about 50mm diameter) pose a real risk. Dead wood becomes brittle and can fall without warning, especially in wind.
A few small dead twigs isn't a problem. A crown that's more than 25β30% dead wood is a serious concern and should be assessed by a qualified arborist.
2. Leaning significantly - especially after a storm
Many trees lean naturally and this isn't always a problem. But a tree that has recently started leaning, or that leans dramatically (more than 15β20 degrees from vertical), warrants a professional look.
Leaning after a storm is particularly concerning - it can indicate the root plate has partially lifted, meaning the tree may already be compromised.
3. Cracks, splits or cavities in the trunk
Vertical cracks or splits in the trunk can indicate structural weakness. Large cavities (hollows) in the trunk reduce the tree's ability to withstand wind loading.
Not all cavities mean the tree needs to come down - many trees live happily with hollows - but they should be assessed to determine how much structural wood remains.
4. Fungal growth at the base or on the trunk
Bracket fungi (the shelf-like mushrooms that grow on tree trunks) are almost always a sign of internal decay. The fruiting body you see above ground is the tip of the iceberg - the fungal network is typically well established inside the wood by the time it's visible.
Fungal growth at the root collar (base of the tree) is particularly concerning as it suggests decay in the critical structural support zone.
5. Root problems - heaving, decay or physical damage
Roots that are heaving out of the ground (especially on the opposite side to the lean) can indicate the root plate is failing. Damaged roots from construction, trenching or soil compaction can also compromise a tree's stability years later.
Major roots that have been cut or damaged within the drip line of the canopy are a red flag.
6. The tree is dead or severely declining
A dead tree should almost always be removed sooner rather than later. As wood dries out and decays, it becomes unpredictable - and removal costs often increase the longer you leave it, as more decay means more technical rigging work.
Signs of severe decline include: no new growth in spring, bark falling off in large sections, and an overall sparse canopy with many dead branches.
7. The location makes it high risk
Sometimes a tree is in reasonable health but in a high-risk location - directly over a house, play area, driveway, or power line. Even a low probability of failure carries serious consequences when the target is significant.
A professional risk assessment can help you make an informed decision about whether the risk is acceptable or whether removal is the better option.
If you're seeing any of these signs, call 022 167 1268 for a free onsite assessment. We'll give you straight-up advice - and we won't recommend removal if it isn't needed.
