Well before a tree dies, it gives us subtle and overt signs that it is stressed and needs help. Based on these signals we can implement a management strategy to give the tree the best chance of survival. 

We low are the 13 top signs a tree is stressed and needs attention to help it survive.

1. Thinning crown or dieback

This is probably the most common sign a tree is stressed. Referred to as dieback and generally located on the very top or crown of the tree,

This indicates the tree is in remission and is no longer growing upwards but consolidating its energy.

crown dieback tree stressed

2. Profuse flowering

This sounds counterintuitive as a tree covered in flowers or fruit would appear healthy. The difference is trees typically have a nice spotted amount of flowers, but if 70% of the foliage is flowers or a ridiculous amount of fruit, it’s a sure sign the tree is fighting for survival.

So why all the flowers? This is the tree’s last-ditch effort to spread its seeds before it dies. Flowering is followed by seeds and or fruit. This is its replication mechanism. Over-flowering is a sure sign a tree is trying its best to spread its seeds before it dies.

Profuse flowering on stress red gum vs normal flowering

3. Deadwood

Noticing a lot of deadwood on a tree indicates it can no longer sustain its current canopy/ number of branches.

Its way of dealing with this is to cut off resources to specific branches and allow them to die. This enables it to sustain a smaller number of branches. This is common in times of drought and changed environmental conditions.

deadwood in oak tree

4. Branch drop

Similar to deadwood, where a tree will cut resources to a certain number of branches and allow them to die, branch drop is where a tree will also shed an entire healthy branch (usually a large lower branch) to achieve the same result. The reduction of to consolidate and survive. Again this happens during times of drought and almost exclusively in the summer.

It’s also referred to as summer branch drop. Eucalyptus and Oak trees are especially prone to this.

Summer branch drop example

5. Wilting

Wilting is caused by a lack of water and turgidity in the tree’s cells. When a tree can not suck up the same amount of water it is expelling due to heat, the tree begins to wilt. This can but fixed very quickly by watering it.

maple tree wilting

6. Heavy or repeated pest infection

Healthy trees don’t usually get boring pests like the elm beetle because its sap is natural protection. When a boring pest such as an Emerald Ash borer attempts to chew its way into the tree, it has to go past the bark.

If the tree is healthy, the sap in the bark will drown the pest before it gets a chance to make an impact. Spotting pest activity signifies that your tree is stressed and unable to produce sufficient sap to protect itself.

Emerald Ash borer attacking tree

7. Heavy sap-flow or abundance

Heavy sap flow leaking out of the tree is not the sign of a super health tree, but one that cannot regulate things. A bit like a tree that is flowering profusely, excess sap flow is a sign your tree is stressed and not coping too well.

heavy sap flow from gum tree

8. Cracking bark

Bark cracking is another sign the tree is drying out and its bark is shrinking and cracking as it does. Like wilting it is a sign the cells of the bark of the tree are lacking water. A quick fix is usually implementing a watering program. However, sometimes bark cracking is caused by trees freezing in the winter or even being struck by lightning.

splitting bark

9. Epicormic shoots/ suckering

If you notice lots of suckers shooting out of the trunk of the tree and arond the base, it’s another sign the tree is suffering. Why is shoots out suckers is not completely known but the theory is it no longer has the resources to keep functioning with it’s normally canopy and is consolidating to numerous smaller shoots close to the trunk. This happens typically in the latter of trees “death-rattle” and you will need to act fast to save it.

Epicormic shoots on trees trunk

10. Leaf dropping

Evergreen trees drop their leaves all year round at a steady rate as it produces new ones. If you notice a thinning of foliage and or an excess of leaves on the ground, it could mean your tree is in trouble.

stressed tree dropping too many leaves

11. Leaf discoloration

Depending on the tree, instead of shedding leaves, they become discolored. This could mean various things from a poor PH balance in the soil to pests and/or disease. You may need the help of a qualified arborist or horticulturalists to diagnose the issue and implement a solution.

Leaf discoloration

12. Premature Autumn color

If you noticed your deciduous tree turning a lot sooner than other trees around it, it could be a sure sign it is suffering and is shutting down for a winter a little early to save resources.

Trees are quite sensitive to environmental changes, so if there is not enough water or even too much, the tree will react in different ways. An easy solution is pruning 30% of the foliage in late winter before spring budding begins.

Premature Autumn color

13. Late budding

Late budding is the opposite of the premature autumn color and is essentially the tree coming out of its winter hibernation late. Again, this can be fixed by trimming 20-30% of the foliage before it is due to bud for spring.

Late budding

What to do if your tree is stressed/ dying?

Even though there are several different signs a tree is stressed and or dying, the best fix to give the tree a new lease on life is to give it a good prune. Typically tree maintenance involves a pruning program that will normally see owners pruning mature trees every 3 – 4 years. If it’s been a while, then trimming 20-30% off the tree will reduce the number of dependants branches and foliage above ground to make it easier for the tree the maintain itself.

Trees thrive when conditions are unchanged. When the accessible water is reduced, the tree cannot maintain the current foliage and begins to recede in several ways described above. Removing foliage will bring the tree back into balance. Often, this will result in a healthy amount of new growth.

Pests and disease treatment

Sometimes a quick trim will not fix the problem. A professional arborist will need to diagnose and treat diseases like Oak wilt or infestations. Get in touch with a local arborist for advice and a free estimate on treating the issue.

Ben McInerney
Author: Ben McInerney - Ben is a qualified arborist with 15 plus years of industry experience in Arboriculture. He ran a successful tree service before turning to writing and publishing. Ben is dedicated to providing users with the most accurate up-to-date information on everything trees.