Three Signs Your Liquid Amber Is Becoming Dangerous

Liquid ambers are one of the most common trees in Melbourne's leafy eastern suburbs — those brilliant red and orange autumn displays along streets in Hawthorn, Kew, Camberwell and Malvern are largely down to this species. But liquid ambers are also one of the most common tree removal jobs we do. They grow fast, get big, and have a couple of structural weaknesses that become real problems as they mature.

Here's what to watch for. If you spot any of these three signs on your liquid amber, it's worth getting an arborist to take a closer look before it becomes an emergency.

1. Co-dominant Stems with Bark Inclusion

Liquid ambers have a tendency to develop what arborists call co-dominant stems — two main trunks of roughly equal size emerging from a Y-shaped fork, often fairly low to the ground. On its own, that's not necessarily a problem.

The problem is bark inclusion — where bark gets trapped between the two growing stems as they thicken, creating a weak V-shaped joint rather than a strong U-shaped union. Over time, this hidden weakness can split the tree apart in a storm, usually without warning.

What to look for:

• A tight V-shape where the two stems meet, rather than a rounded U
• Visible bark running into the fork rather than bulging out around it
• Vertical cracks or splits in the bark at or near the union
• The tree leaning slightly to one side, suggesting the union is already under stress

Trees with significant bark inclusion can often be saved with cabling or bracing — an arborist installs steel or synthetic cables higher up to redistribute the structural load. This is usually a much better outcome than full removal, particularly for a large feature tree.

2. Sudden Dieback in the Upper Canopy

If you notice bare, brittle branches in the top third of the tree while the rest of the canopy looks healthy, pay attention. Upper canopy dieback in liquid ambers is often a sign of root problems — root rot, compacted soil, or damage from nearby excavation.

The root system can't supply water to the highest branches first, so those are the first to fail. By the time you're seeing significant dieback, the issue has usually been developing for several years.

A liquid amber that's shedding leaves unusually early in autumn, or has visible bare patches in the canopy while neighbouring trees are still in full leaf, is telling you something. It's worth an arborist visit.

Sometimes dieback can be managed with crown thinning, soil aeration and deep watering. Other times, it's a sign the tree is approaching the end of its structural life and planned removal is the safer option.

3. Large Surface Roots with Lifting or Cracking Around Them

Liquid ambers have aggressive, shallow root systems — which is great for the tree's stability in storms but terrible for nearby paving, drainage and foundations.

If you see surface roots lifting the ground significantly, or cracks forming in your driveway, footpath, retaining walls or house foundations near the tree, act before the problem gets worse. Tree root damage to infrastructure can cost tens of thousands to repair, and once foundations are affected, the options narrow quickly.

Signs to take seriously:

• Surface roots wider than your forearm, particularly within 3-4 metres of a structure
• Cracks in concrete, brick or rendered surfaces running toward the tree
• Doors or windows sticking that previously closed properly
• Visible upheaval in paving, garden beds or turf near the base

Root pruning is possible in some cases, but it weakens the tree's stability and can accelerate decline. Often the most honest advice is to plan a staged removal before the roots cause structural damage.

What to Do If You See Any of These Signs

The first step is an arborist assessment — which we provide free of charge. Send us a photo of the tree with something for scale (a person, a bin, a car) and a note describing what you're seeing. We'll tell you whether we think it's urgent, routine, or something you can monitor.

If the tree is in a Boroondara, Stonnington or Manningham garden, chances are it's covered by some level of tree protection — even if it's showing structural problems, you may need a permit to remove it. We handle the permit process and the arborist reports as part of our service.

And worth saying: liquid ambers are beautiful trees when they're healthy. Many can be managed through careful pruning, cabling and soil remediation for decades. Removal should be the last option, not the first. But knowing when a tree has crossed the line from "quirky" to "dangerous" is exactly what you pay an arborist for.