Do you have an olive tree with brown leaves, black leaves, or curled leaves? You are certainly not the only one. Especially in the Netherlands and Belgium, many olive trees suffer from leaf problems after winter, during dry summers, or due to improper care.
Fortunately, brown, black, or curled leaves do not always mean that an olive tree is dying. Often, it is a natural reaction to frost, drought, overwatering, or a change of location. By correctly identifying the cause, you can take the right measures and the tree will often regain a healthy appearance on its own.
In this comprehensive article, you will read what causes brown, curled, and black leaves, how to recognize the cause, and what you can do to get your olive tree healthy again.
Brown, curled, or black leaves on an olive tree? In short
Most leaf problems are related to care, the weather, or the conditions in which the tree grows.
| Problem | Most common cause |
|---|---|
| Brown leaves | Drought, frost, old leaves, or water stress |
| Curled leaves | Too little water, heat, or root stress |
| Black leaves | Frost damage, prolonged wet soil, or fungus |
| Brown leaf tips | Temporary moisture deficiency |
| Black leaves after winter | Frost damage |
| Curled leaves in summer | Heat and evaporation |
Are you unsure whether your tree has survived the winter well? Then also read our comprehensive article on When does an olive tree flower again? There you will read when new shoots normally appear and how to check if the tree is still alive.
Why does an olive tree get brown leaves?
Brown leaves are by far the most common problem with olive trees. Fortunately, in many cases, this is completely normal. An olive tree is an evergreen tree, but even evergreen trees replace part of their leaves every year.
In addition, weather conditions or care mistakes can cause leaves to turn brown temporarily. The most common causes are:
- natural leaf replacement;
- drought;
- too much water;
- frost damage;
- root problems;
- a change of location.
Natural leaf replacement
Many people are alarmed when an olive tree gets brown leaves in spring. However, this is often part of normal growth. Older leaves make way for new leaves. This usually happens between March and May, exactly when the tree starts to flower again.
Do you see new light green shoots appearing at the same time? Then you usually do not need to worry. The tree uses its energy to form new leaves.
Are the leaves turning yellow instead? Then also read our article about yellow leaves on an olive tree, in which we explain the most common causes and solutions.
Too little water
During warm summers, olive trees can dry out faster than many people think. Olive trees in pots suffer from this especially, because the pot soil dries out much faster than soil in the ground. Therefore, always provide a suitable large outdoor pot that is large enough for the root ball.
Typical characteristics are:
- brown leaf tips;
- dry leaves;
- leaves that hang down;
- curled leaves;
- leaf drop.
Therefore, always check the soil first before giving extra water. Is the soil completely dry several centimeters deep? Then the tree probably needs water. Also read our comprehensive article How much water does an olive tree need? to determine exactly when you should or should not water.
Too much water
Interestingly, too much water often causes the same complaints as drought. When the roots stand wet for a long time, they receive insufficient oxygen. As a result, they hardly absorb any more water, which in turn causes the leaves to dry out. Common signs are:
- brown leaves;
- limp leaves;
- leaf loss;
- a musty smell from the pot;
- continuously wet pot soil.
Therefore, never water according to a fixed schedule, but always check first whether the soil is actually starting to dry out.
Frost damage
After a cold winter, leaves may first turn brown or grayish-brown before they eventually fall off. This does not automatically mean that the olive tree is dead.
Often only the leaves are damaged while the trunk and roots are completely healthy. As soon as the temperatures rise, the tree forms new shoots. Therefore, always check first whether the trunk is still alive before deciding to prune the olive tree or replace it.
Root problems
Healthy roots ensure healthy leaves. When the roots are damaged by prolonged wet soil, a pot that is too small, or poor drainage, you will often see this reflected in the leaves first. Therefore, always choose a high-quality olive tree pot with sufficient space and good drainage holes.
The tree may then absorb insufficient water and nutrients, causing the leaves to slowly turn brown. Therefore, always check:
- whether excess water can drain away properly;
- whether the pot has drainage holes;
- whether the roots have enough space;
- whether the soil remains airy.
Why do the leaves of an olive tree curl?
Curled leaves are usually a protective reaction of the tree. By curling up the leaves, the olive tree reduces evaporation. In this way, it tries to retain as much moisture as possible. This is especially visible during warm summer days or when the tree temporarily receives too little water.
Drought
The most common cause is simply a lack of moisture. When the roots cannot absorb enough water, the leaves partially close to counteract evaporation.
You will also often see:
- dull leaves;
- slightly drooping branches;
- dry pot soil;
- brown leaf tips.
Then do not immediately give enormous amounts of water, but rather water slowly so that the entire root ball becomes evenly moist.
Heat and bright sun
Even healthy olive trees can temporarily get curled leaves during extremely warm days. This is a natural protection against dehydration. As soon as the temperature drops or the tree again has sufficient moisture, the leaves usually open up again on their own.
Roots receive too little oxygen
When the soil remains wet for a long time, the roots receive insufficient oxygen. As a result, they absorb less water, while the leaves lose a lot of moisture. The result is that the leaves start to curl, despite the soil being wet. This is one of the reasons why good drainage is so important.
After transplanting
Has your olive tree recently received a new pot or location? Then the Mediterranean tree may temporarily suffer from stress. During this recovery period, you may sometimes see:
- curled leaves;
- leaf loss;
- less growth.
Usually, a healthy olive tree recovers on its own as soon as the roots take hold again.
Why do the leaves of an olive tree turn black?
Black leaves usually occur because the leaf has been damaged. In the Netherlands and Belgium, this often happens after a period of frost, prolonged rain, or because the roots have been too wet.
Fortunately, black leaves do not automatically mean that the olive tree is lost. Often only the leaves are damaged, while the trunk and roots are still completely healthy.
The most common causes are:
- frost damage;
- prolonged wet soil;
- fungus;
- dead leaves;
- root rot.
Black leaves after frost
After a cold winter, many olive trees in the Netherlands suddenly look dark brown or even black. This is because the moisture in the leaves froze during the frost. This damages the leaf cells.
The leaves first become limp and dark, after which they eventually dry out and fall off. Therefore, always check the condition of the trunk first before thinking that the tree is dead.
Prolonged wet soil
Olive trees absolutely do not like wet feet. When the roots stand in wet soil for weeks, oxygen deficiency occurs. The roots function increasingly poorly, causing the leaves to discolor from green to dark brown or black. You will also often see:
- limp leaves;
- little new growth;
- leaf loss;
- a musty smell from the pot.
Therefore, always check whether excess water can drain away properly.
Fungus
Although a healthy olive tree suffers little from fungus, prolonged damp conditions can cause fungal problems.
You often recognize this by:
- black spots;
- dark spots on leaves;
- leaf loss;
- damp conditions.
Remove affected leaves and ensure that the crown can dry sufficiently through sufficient air circulation.
Root rot
When an olive tree stands too wet for months, the roots can start to rot. The first signs are often visible in the leaves. Symptoms include:
- black leaves;
- brown leaves;
- limp shoots;
- hardly any new growth;
- a soft or musty root ball.
Prevention is much more important than cure here. A well-draining soil prevents problems in most cases.
Brown leaves after winter
After winter, we at Olivera Garden receive many questions every year from customers who think their olive tree did not survive the frost. In reality, many trees recover surprisingly well. The tree used little energy during the winter and uses its reserves as soon as the temperature rises to form new shoots.
Even when almost all the leaves have turned brown, the trunk can still be completely healthy. Therefore, be patient and check the condition of the tree first before you start pruning.
Curled leaves during warm summers
Not only winter can cause leaf problems. During warm summer days, you regularly see leaves curling up. This is a natural protective reaction. By making the leaf smaller, the olive tree reduces evaporation.
Especially olive trees in pots can more quickly suffer from a warming root ball during warm summer days, especially when the pot stands in the full sun for a long time. Therefore, during warm periods, regularly check:
- the moisture of the soil;
- whether the tree gets enough sun without extremely warming stones around the pot;
- whether excess water can drain away properly.
How do you recognize the cause of leaf problems?
The table below helps you to recognize the right cause more quickly.
| Symptom | Probable cause |
|---|---|
| Only brown leaf tips | Temporary moisture deficiency |
| Entirely brown leaves | Old leaves or drought |
| Black leaves after frost | Frost damage |
| Curled leaves | Drought or heat |
| Limp black leaves | Too wet soil |
| Brown leaves with new shoots | Normal leaf replacement |
| Yellow and curled leaves | Root stress |
| Black leaves without new growth | Possible root damage |
What should you do about brown leaves?
Do not panic immediately. First calmly check the cause.
Check the soil
Does the soil feel dry? Then the tree may need water. Is the soil very wet instead? Then wait with watering.
Check the drainage
Check whether excess water can drain properly out of the pot. An olive tree grows best in airy, well-draining soil.
Check new buds
Do you see small light green buds appearing? Then the tree is already engaged in new growth. Old leaves will disappear on their own.
Do not prune too quickly
Many people immediately start cutting away all brown branches. This is often not necessary. Wait first until it is clearly visible which branches have actually died.
What should you do about black leaves?
The same applies here: first determine the cause.
Check:
- is the trunk still alive?
- does the tree feel firm?
- are new buds appearing?
- is the soil very wet?
When only the leaves have turned black after a frost period, there is a good chance that the tree will recover on its own.
Can an olive tree recover?
Yes. What's more: older olive trees often recover surprisingly well.
Even when a large part of the leaves has been lost, the trunk and roots still contain a lot of stored energy. As soon as the temperature rises, the tree often forms buds and young shoots again.
At Olivera Garden, we see trees every spring that still look completely bare in March, but develop a healthy, full crown again a few weeks later. Is your olive tree losing a lot of leaves? Then also read our comprehensive article on why an olive tree loses leaves, in which we explain the most common causes and solutions step by step.
Common mistakes with brown, curled, or black leaves
At Olivera Garden, we receive many questions every year from people who think their olive tree is lost. Fortunately, in practice, this is often not the case at all.
These are the most common mistakes.
❌ Immediately thinking that the tree is dead.
❌ Watering daily as soon as the leaves turn brown.
❌ Immediately pruning away all brown branches.
❌ Immediately putting the tree inside.
❌ Fertilizing while the tree is not yet actively growing.
❌ Using the pot without drainage.
❌ Thinking that black leaves always mean that the tree can no longer be saved.
With a little patience, many olive trees recover on their own as soon as growth gets going again.
Practical checklist
Are you unsure why your olive tree has brown, black, or curled leaves? Then check the points below.
✅ Check whether the soil is dry or very wet.
✅ Look if small new buds appear.
✅ Perform the scratch test on a few branches.
✅ Check whether the trunk feels firm.
✅ Check whether excess water can drain away properly.
✅ Only water when the soil starts to dry out.
✅ Only prune when it is clearly visible which branches have died.
✅ Give the tree enough time to recover.
By performing these simple checks, you prevent unnecessarily writing off a healthy olive tree.
How do you prevent brown, curled, or black leaves?
Prevention is, of course, better than cure. With the right care, olive trees remain healthy for years and get leaf problems much less quickly.
Choose a sunny location
An olive tree loves sun and warmth. The more sunlight the tree gets, the stronger and healthier it grows.
Only water when necessary
An olive tree prefers one good watering than a little water every day. Therefore, always check the soil first before watering.
Ensure good drainage
Olive trees absolutely do not like wet roots. Therefore, always use a pot with drainage holes and well-draining soil. This prevents root rot and leaf problems.
Protect the tree during severe frost
Although olive trees are fairly winter hardy, prolonged periods of severe frost can cause damage. By protecting the tree well during cold periods, you prevent many problems in spring. Also read our article Preparing an olive tree for winter.
Prune at the right time
Never prune immediately after a cold winter. Wait until it is clearly visible which branches are still alive and which have actually died. This will prevent you from removing healthy parts of the tree.
When will the leaves recover?
That depends on the cause. In the case of drought, you will often see improvement within a few days once the tree receives sufficient moisture again. After frost, recovery can take several weeks.
Has the tree suffered root damage? Then recovery can take several months. New leaves usually do not grow from damaged leaves. Instead, the olive tree forms new shoots with fresh, healthy foliage.
Brown leaves do not always mean an unhealthy olive tree
Many people think that any brown or black discoloration is a bad sign.
Fortunately, that is not true.
A healthy olive tree replaces part of its leaves every year. Even after a cold winter or a dry summer, the tree may temporarily look less attractive without there being any permanent damage. Therefore, always look at the overall picture.
Does the tree have:
- new buds?
- sturdy branches?
- a healthy trunk?
- new shoots?
Then there is a good chance that it will fully recover.
Check first, then take action
The color, structure, and position of the leaves often reveal what is causing an olive tree problems. Moreover, many olive trees are stronger than you might expect. After a cold winter, some olive trees may appear completely bare or have brown and black leaves. Nevertheless, new buds and fresh shoots often appear a few weeks later.
In fact, older olive trees have a strong root system and plenty of stored energy, which often allows them to recover surprisingly well. Our advice is therefore almost always the same: check the trunk, branches, and roots first before drawing any conclusions. In many cases, patience is the best care you can give an olive tree.
Conclusion
Fortunately, brown, curled, or black leaves on an olive tree do not always mean the tree is lost. Often, weather conditions, temporary water stress, natural leaf replacement, or light frost damage are the cause. By calmly checking what is wrong first, you prevent unnecessary worry and incorrect care.
Always check the condition of the trunk, branches, and roots before pruning or watering extra. Do you see new buds or young shoots appearing? Then that is usually a clear sign that the olive tree is recovering. With the right location, good drainage, the right amount of water, and a little patience, most healthy olive trees will recover on their own and develop a full, green crown again.
If you are not entirely sure or do not know why your olive tree is getting brown, curled, or black leaves, feel free to contact Olivera Garden. We are happy to help you with personal and honest advice, so that your olive tree has the best chance of recovering.
Frequently asked questions about brown leaves on an olive tree
Does an olive tree lose its leaves every year?
Yes. An olive tree is evergreen, but it does not retain its leaves indefinitely. Older leaves are replaced by new foliage every year, usually in spring. A limited amount of leaf loss is therefore completely normal and no cause for concern.
Can an olive tree grow new leaves without pruning?
Yes. A healthy olive tree forms new leaves and shoots on its own as soon as growth gets underway again. Pruning is only necessary to remove dead, damaged, or unwanted branches and is not required to stimulate new leaf growth.
Why are only the tips of my olive tree's leaves turning brown?
Brown leaf tips are usually caused by a temporary lack of moisture, dry wind, or fluctuating weather conditions. Check that the potting soil has not completely dried out and only water when the soil begins to dry out.
Do brown or black leaves ever turn green again?
No. Leaves that have turned brown or black due to frost, drought, or other damage will not turn green again. However, a healthy olive tree can form new shoots and fresh foliage, allowing the tree to gradually recover.
Does an olive tree with leaf problems need extra nutrients?
Not always. When the cause is drought, frost, or too much water, extra nutrients will not solve the problem. Only fertilize an olive tree when it is actively growing again, and use a fertilizer suitable for Mediterranean plants.
How can I prevent my olive tree from getting brown or black leaves again?
The best way is to place the olive tree in a sunny location, ensure good drainage, and only water when the soil begins to dry out. Protect the tree during prolonged frost and regularly check the condition of the leaves so that you can address any problems early on.
