To tell if a tree is dead, scratch a little bark off a twig with your fingernail. Green, moist wood underneath means that part is alive, while brown, dry wood means it is dead. Check twigs on several sides of the tree, and look for other signs like brittle branches, bark falling off, and mushrooms at the base.
A tree can also be partly dead, or alive but failing. Here is how to check, what the warning signs mean, and why a dead tree is not something to wait on.
The scratch test
Use your fingernail or a pocketknife to scrape away a small strip of bark on a twig. Just under the bark is a thin layer that is green and moist on a living branch. If it is brown and dry, that branch is dead.
One twig does not tell the whole story. Test several twigs on different sides of the tree, and work your way in toward the trunk. If every test comes up brown, the tree is likely dead or very close to it.
The snap test and the bud check
Living twigs bend. Dead twigs snap with a dry crack. Try bending a few small twigs and see what happens.
In fall and winter, look closely at the twig tips. Healthy trees set their buds for next spring before the leaves drop. Plump buds are a good sign. Twigs with no buds, or with dry, shriveled buds that crumble, point to dead wood.
One thing that is normal: some trees, especially young oaks, hold on to dry brown leaves well into winter. That alone does not mean the tree is dead.
Other signs of a dead or dying tree
Bark falling off. Large patches of bark that peel away and leave bare wood are a strong sign that part of the tree has died.
Mushrooms or fungus at the base. Mushrooms, shelf-like growths, or other fungus on the trunk or around the roots often mean there is decay inside. A tree can look fine on the outside and still be rotting where you cannot see.
Cracks and splits. Deep cracks in the trunk or where big limbs meet the trunk can be a sign of weak or dead wood.
No leaves in season. If a tree did not leaf out in spring, or one side stayed bare while the rest leafed out, those branches are likely dead. Ash trees that thin out from the top down may have emerald ash borer.
Why fall and winter are a good time to check
With the leaves down, you can see the whole tree. Dead limbs, cracks, missing bark, and woodpecker damage are much easier to spot on a bare tree than one covered in leaves.
It is also a good time to act. Frozen ground holds heavy equipment better, which means less damage to your lawn, and a dead tree that comes down in winter will not be there to drop limbs in spring and summer storms.
Why dead trees get more dangerous over time
Once a tree dies, the wood starts to dry out and decay. It becomes brittle and weaker every year. Dead limbs can fall without warning, even on a calm day, and the whole tree can fail in wind or under snow and ice that a healthy tree would handle.
Brittle wood also makes removal harder. A dead tree can break in ways that are hard to predict, so it is not safe to climb or cut the way a living tree is. Crews often use a bucket truck or a crane to take it down in pieces from a safe position.
Dead tree removal is a job for a pro
A small dead shrub or a sapling you can cut from the ground is one thing. A dead tree that is taller than you, near a house, garage, fence, or power line, or dropping limbs is something else. This is not a DIY job, and it is not a job for someone with a chainsaw and a ladder.
If you are not sure whether a tree is dead or just struggling, an ISA Certified Arborist can tell you. At A Tree Service, we will look at the tree during a free estimate, tell you plainly whether it can be saved, and if it needs to come down, how we would do it safely.
Quick answers
How can I tell if my tree is dead or just dormant?
Do the scratch test. Scrape a little bark off a twig. Green, moist wood underneath means it is alive, even in winter. Brown, dry wood means that branch is dead. Test twigs on several sides of the tree.
Can a dead tree come back to life?
No. Once a tree is fully dead, it will not recover. A tree that is only partly dead can sometimes be saved by pruning out the dead wood, if the rest of the tree is healthy.
Are mushrooms at the base of a tree a bad sign?
Often, yes. Mushrooms or shelf-like fungus on the trunk or roots usually mean there is decay inside the tree. Decay weakens the wood, so it is worth having an arborist look at it.
How long can a dead tree stand before it falls?
There is no safe way to predict it. Some dead trees stand for years, and others drop limbs or fail within months. The wood gets weaker every year, so it is best not to wait.
Who removes dead trees near New Brighton, MN?
A Tree Service Inc. in New Brighton, MN, removes dead and dying trees across the Twin Cities metro using bucket trucks and our own crane. Estimates are free.