How to Tell if Your Tree is Sick or Dangerous (And What to Do Next)

Trees are a beautiful and essential part of any outdoor space, but when they’re sick or damaged, they can quickly become a safety concern. Knowing the signs of a problem and acting quickly can protect your property and keep everyone safe. Here’s how to tell if your tree might need help from a professional tree surgeon.

Why Early Detection Matters

Catching these symptoms early can save your tree. Some issues, like dehydration or minor infections, can be treated and reversed with professional care. However, if the damage is severe, it’s best to have the tree removed safely to avoid property damage or injury.

Signs Your Tree Might Be Sick or Dangerous
1. Leaf Symptoms

Leaves are often the first sign that something isn’t right with your tree. Look for:

  • Excessive or Sudden Leaf Drop: If your tree sheds leaves unexpectedly in spring or summer, it could be stressed or diseased.
  • Discoloured or Shriveled Leaves: Yellow, brown, or curling leaves during the growing season may signal root issues, pests, or dehydration.
  • Bare Patches: A healthy tree should have consistent foliage. If sections of the canopy are bare, the tree may have localised decay or damage.

2. Branch Symptoms

Branches play a vital role in tree health and stability. Watch out for:

  • Falling Bare Branches: Branches that drop without leaves often point to rot or stress.
  • Brittle or Cracked Branches: Healthy branches should bend without snapping. Dry, brittle branches are a bad sign.
  • Insect Damage or Rot: If you notice tiny holes, sawdust, or decay on fallen branches, pests or disease may be to blame.

3. Trunk Symptoms

The trunk is the backbone of your tree. Inspect it for:

  • Holes or Cavities: Hollow areas or holes in the trunk may indicate internal decay.
  • Cracks or Splits: Deep vertical cracks can weaken the tree’s structure and increase the risk of falling.
  • Mushy or Hollow Areas: A soft, spongy trunk, or one that sounds hollow when tapped, is often a sign of rot.

4. Bark Symptoms

Healthy bark protects your tree from pests, disease, and weather. Warning signs include:

  • Flaking or Peeling Bark: Large patches of bark falling off could mean the tree is in distress.
  • Brittle or Cracked Bark: Soft, pliable bark is a sign of health. Dry, cracked bark suggests dehydration or disease.
  • Bald Spots: Areas of missing bark expose the tree to infection and pests.

5. Root Symptoms

Tree roots are easy to overlook but are critical to your tree’s health. Look for:

  • Physical Damage: Roots damaged by vehicles, mowers, or construction can compromise the entire tree.
  • Waterlogged Roots: Consistent flooding or soggy soil can cause root rot and instability.
  • Fungal Growth: Mushrooms or other fungi near the base are often a sign of unhealthy, decomposing roots.

6. Fungi and Mushrooms

Fungal growth is a red flag for serious internal issues. Common signs include:

  • Mushrooms on the Trunk or Branches: These indicate rot inside the tree’s structure.
  • Bracket Fungi: Shelf-like fungi growing on the bark are often a sign of heartwood decay.
  • Mushrooms Around the Base: Fungi in the soil at the tree’s base often point to root rot.

How to Inspect Your Tree

Perform regular checks on your trees to catch problems early:

  • Walk Around the Tree: Inspect it from all angles, focusing on leaves, branches, bark, and the trunk.
  • Examine the Roots: Look for damage, flooding, or fungi around the base.
  • Tap the Trunk: Use a stick to lightly tap the trunk. If it sounds hollow, there may be internal decay.
  • Note Any Changes: Compare your tree’s current condition to how it looked in previous seasons. Sudden changes are the most telling.

What Should You Do If You Spot These Symptoms?

If your tree shows any of these signs, here’s what to do next:

  • Don’t DIY Tree Care: Sick or damaged trees can be unpredictable and dangerous to work on without the proper tools and training.
  • Call a Professional Tree Surgeon: A qualified arborist, like the team at London Treescapes, can assess the problem and recommend solutions.
  • Stay Safe: If you suspect a tree might fall, keep people and pets away until it has been inspected.

Why Choose London Treescapes?

At London Treescapes, we’re passionate about preserving the health and beauty of London’s trees. We're based in Blackheath, South East London and cover Lewisham, Greenwich and beyond working all around the city. Our friendly, expert team specialises in diagnosing tree issues, offering practical advice, and providing safe, professional care. From treatment to removal, we prioritise safety, conservation, and customer satisfaction.

Concerned about your tree’s health? Contact us today for a free consultation and quote. Let’s keep your trees—and your property—safe.

Email: enquiries@londontreescapes.co.uk