Eucalyptus Leaves Turning Brown: Causes & Fixes

Eucalyptus is mostly found in Australia and is a portion of delicious food for koalas. It catches immediate attention with the vibrant green, thick and glossy leaves.

The leathery feel that you get from eucalyptus can grow 1.5-2 dm. It contains the ingredient called “cineole” which is used for pharmaceutical matter as stomachache, dizziness, muscle weakness, and suffocation mostly.

Fun Fact: for people in Australia, the eucalyptus is the holy tree that symbolizes the severance of two worlds, earth, and heaven.

Plus did you know that during a bush fire, eucalyptus can explode because of the natural oil production?

Now, I’m done giving the general knowledge about the plant, and the time to find out what the heck is wrong with the brown leaves knocking on the door and ruining the entire mood.

The thumb rule of brown leaves is the need for instant removal. There is no point in keeping the dead leaves just to feel an eyesore. Waiting longer will do more harm than good because the component called terpinen-4-ol (found in aromatic plants) will spread in the entire plant and cause death of the plant.

Why are my Eucalyptus Leaves Turning Brown?

 A dying eucalyptus turns brown and the shed bark starts the unpleasant color from the trunk. Improper watering is also known as the most common mistake that turns the leaves of eucalyptus brown. 

Another reason can be crown rotting which the main cause is fungi disease. The insects usually make a feast entertainment underneath the leaves and over time this eventually kills the entire tree.

Eucalyptus is a real sun lover, coming from boiling hot temperatures of Australia, it isn’t that hard to know they need a lot of sun exposure every single day.

6 Reasons Why the Eucalyptus Plant Leaves Turn Brown

Inadequate Watering

As coming from natural habitat, eucalyptus goes through extreme heat and rain as well. So it’s considered a drought-tolerant plant. Even though it can handle the heat, it is sensitive to underwatering and for that reason, they react by making leaves brown.

Also, overwatering can cause leaves to turn brown. Adding excessive water can lead to root rot and eventually kill the plant. 

For the potted version, watering frequency is more often because the moist soil stays longer on the ground than on the pot. 

Either way, you will end up losing leaves and not only brown leaves but also branches will turn brown.

Lack of Sunlight

 Brown foliage is an indication of not getting enough daily sun exposure. Eucalyptus asks for full sun and the potted version tends to dry much quicker (if it’s possible, avoid direct light).

For indoor planting apply the same rule, full but indirect light. If they do not get sufficient sunlight exposure throughout the day, most probably the leaves will start to fall off from the base.

Humid Environment

If the eucalyptus location is humid, the reaction goes directly to the leaves. Excessive humidity causes the leaves to turn yellowish more than brown. 

Soil Texture

Even though eucalyptus can tolerate nearly all kinds of soil, a slightly acidic pH level would be always in the list of favorites.

The most important part of poor soil and drainage will happen when the water will clog the roots and cause rotting. 

Wrong Container & Pot Size

Look at the size of the plant, it would be foolish of you to plant a small pot size to a giant eucalyptus plant. 

Fungi Disease 

Pests seem to never leave the eucalyptus alone causing the leaves to turn brown. Leaves are feast entertainment for insects such as beetles, whiteflies, and wasps. 

Fungi disease won’t stop until you take a step to prevent it, not only brown leaves but they are most likely to kill the entire tree. 

How To Prevent Eucalyptus Plant Leaves From Turning Brown

Stick to Watering Schedule

Instead of random watering, wouldn’t be better to keep a schedule of watering and prevent over and underwatering. 

In hot weather conditions, water eucalyptus at least once a week and once the plant is matured, it can go from 7-21 days. 

If eucalyptus is located indoors, increase the frequency of watering and use more sandy soil because water evaporates faster on the pot than on the ground.

The best way to find when to water is by touching the soil, if it feels dry two inches deep then water the plant, otherwise don’t. Additionally, adding an irrigation system would be a solution if keeping up with the schedule seems hard.

Find the Ideal Soil 

For potted eucalyptus, fill the pot with a combination of 70% loam soil and 30% horticultural potting grit to upgrade drainage. 

As for the pH, eucalyptus should be slightly acidic at 5.5 to 6.5 levels. Even though it can deal with every type of plant, with the preferred soil type, you can grow a happy and healthy plant.

Treat the Diseased Eucalyptus Tree with Fungicide

Using fungicides to keep the pests and their spores away from the eucalyptus plant. Pests usually live on the undersides of the plant and make holes in the leaves and turn them brown.

To repair soft brown leaves, immediately change the pot, take outdoors, water it, and put it somewhere with full sunlight for a couple of days. 

To get rid of fungi disease (for the period between 2-6 weeks), add 1 teaspoon of eucalyptus oil together with 1/2 teaspoon of liquid hand soap or detergent and 2 cups of water.

Eucalyptus Requires Full Sun Exposure

Eucalyptus needs a good 10 hours of sun exposure to thrive. If the plant is on the pot, locate close to a south-facing window. 

Brief Recap 

I love how Australian people consider the eucalyptus as a holy tree that symbolizes the severance of two worlds, earth, and heaven. Plus, self-exposure is the cherry on top of plat’s characteristics. 

There isn’t only one reason behind the brown leaves, but by acting instantly, you won’t let the plant die. Start by keeping a watering diary, then check the undersides of the plant if the pests have invaded the area. Take outdoors to get good lighting and pick slightly acidic soil.

Further Reading 

Want to read other informative articles? Check out the watering frequency in Bougainvillea, as well as prevent underwatering and overwatering in Cilantro.

Alternatively, find out whether can an air plant live outside and a short guide to keeping a money tree outside.

Aurora Hansen

About Us

FlowerPictures is a website dedicated to the most beautiful things in life - PLANTS!

Its run by enthusiast gardeners that have years of experience.