How to Treat Root Rot in Hydrangea

Last Updated on November 3, 2022 by Stephanie

Who doesnt like the Hydrangea with its fun flower pom-poms? However, this plant may not be happy if its surrounded by root decay!

If your hydrangea is beginning to appear a bit sluggish lately, it could be suffering from this fungal disease.

The good news is that Hydrangeas are able to recover from root rot, but you must get the skates on! The fastest way to take action is the most effective method of action in the case of root rot.

To treat rot in the hydrangeas root, begin by trimming off the mushy, brown, decaying roots. Apply a fungicide that is effective to clean the healthy roots. Repot the soil mix in a new container.

The longer you wait the longer you leave it, the more likely it is that rot will be able to take over the plant permanently. Therefore, we should avoid it at all cost! Read on to learn how you can keep that rotten decay at bay!

Signs of Hydrangea Root Rot

There are a variety of Hydrangea root rot, which can produce various signs.

The most frequent symptoms of root rot are the following:

Causes of Hydrangea Root Rot

How to save Hydrangea From Root Rot

Here are some steps you can do to help save your root rot-affected Hydrangeas:


Repotting is the most effective method to keep your Hydrangea free from the ravaging grip that root rot. The fungus responsible for root rot may be present within the soil in the pot, or on the roots and plant. Repot cautiously using these methods:

  1. Before transplanting. Make sure you wash it thoroughly with any tools you might employ.
  2. Take your Hydrangea from the pot in which it was planted and trim the brown, mushy roots (these are infected by rot).
  3. Cleanse your plants rootball thoroughly in order to remove any fungal spores that remain.
  4. Repot using fresh, clean soil. Re-using soil could lead to the transfer of the spores into the new pot.

Using Appropriate Soil Mix

Selecting a soil mix that drains well is an essential step to prevent root rot. Be sure to avoid any type of dirt or mix that has come into contact with plants that have been infected!

  1. Avoid soil that has excessive clay. It wont permit enough oxygen to reach the roots or for water to pass through them, and can cause root decay.
  2. The best choice is to purchase potting soil. When choosing the potting mix, select one that is described as well-draining, so that youll have no doubt about the quality that the soil has.
  3. If you decide to create the mix yourself, make sure to include perlite plant mulch composted wood chips as well as blood meal, to ensure that the soil is adequately aerated while providing the proper nutrition to the Hydrangea.

hydrangea blue near white picket fence

Watering After Repotting

There are different guidelines regarding watering your newly potted Hydrangea dependent on whether its dormant or not.

It is essential to keep a dormant Hydrangea thoroughly after the repotting. This means that you must ensure that you damp the soil after watering.

Following this, it might not require any water until the dormant time has ended.

If you decide to transplant your Hydrangea in the time that its not dormant, make sure you be sure to water it three times per week.

Be sure to not sprinkle water on the leaves and then water them thoroughly each time. It is essential to ensure that the drainage is adequate to prevent waterlogging.

Chemical Treatment

It is possible to use a fungicide to treat certain types of root rot that affect Hydrangeas. A fungicide based on copper is the best choice in this instance.

Spray the fungicide on the plant following the directions, then placing your Hydrangea in your new garden.

Care After Repotting

Be vigilant about the recently repotted Hydrangea and ensure that its getting the correct amount of water.

While Hydrangeas prefer to be well maintained, the soil should not be damp, and you must ensure that the water drains well inside the pot that it was placed in.

Be extra attentive to your Hydrangea after the repotting process is a good way to ensure that it isnt suffering from the same issues like it did before.

Repotting can put an end root rot, so long as the conditions in the pot do not encourage further decay.

Homemade Treatment for Hydrangea Root Rot

You now are aware of the best way to take care of your hydrangeas root decay. Lets talk about ways to prevent it to ensure that you dont need to be concerned about the possibility of a root rot-related infection.

1. Sterilize the Cuttings

If you are taking cuts from your Hydrangea it is recommended to make use of sterilized pruning tools to prevent the spreading of any fungal spores that transfer into the plants from your tools.

Spray the cut pieces with a solution of 10:1 bleach/water and gently rub them down using an ointment or a brush after which you can let them air dry.

This will eliminate any spores that remain on the cuttings that could cause root rot to the new plant.

2. Seed Treatment Before Sowing

It is possible to treat Hydrangea seeds by using a fungicide prior to sowing them. This will prevent seeds and fungal diseases that are transmitted by soil onto the plant as it develops.

To treat fungal illnesses. These are the fungalicides that I suggest:

3. Disinfect Pots

Infecting your pots prior to planting your Hydrangeas in them is an excellent way to stop root rot.

The fungus known as root rot can be present on pots that have come in the contact of spores. The spores could be in the soil or on the plant or they may have made their way to the container through another method.

The most effective method to disinfect the plant pot is by soaking it in an aqueous solution of 1 part bleach and 9-parts water over a period of 10 mins.

After you have soaked the pot with bleach, you should be sure to clean it thoroughly with dishesoap and water in order to get rid of the bleach.

4. Sterilize Soil

Sterilizing soil is a way to eliminate pathogens that are present in soil.

It is possible to sterilize soil that has been infected by putting a layer of soil approximately four inches (10cm) deep, on an oven-safe dish or tray. cooking.

The soil should be covered with foil, then bake for at least thirty minutes, at 180 to 200oF (82-93oC).

It is also possible to sterilize soil by using the microwave. Put the soil in an oven-safe container, then cover the container with a lid that has vent holes. For every pound of soil (450g) the temperature should be maintained for 90 seconds at full power.

5. Disinfect Tools

The fungi responsible for root rot could spread to other plants through the tools you employ.

It is important to clean all the tools you employ on your plants frequently even if youre not aware of any plants that have root decay.

The most important thing that your Hydrangea requires is to be attacked by fungal spores that were transferred from a different plant, without your knowledge!

Soak the tools in a solution of 1 part bleach to 9-parts water following making use of them. Then, clean them using dish soap.

6. Wash Hands Before Handling Plants

It is easy to move between your plants by touching them, and then pruning them, but not consider possible spread of something through your fingers to the plants you have.

It is recommended to clean the hands you have touched after handling your plants before you tend to the next plant. This is an easy method to prevent spreading bugs, infections or spores between plants the next.

Also, your hands could have been exposed to something harmful from the outside world and then brought inside your home to your plants. Its recommended to clean them frequently!

7. Maintain Humidity and Temperature

Hydrangeas thrive in humid conditions and should be kept at a moderately warm temperature, between 65 and 75oF (18-24oC).

A healthy humidity level will ensure that you dont get inclined to sprinkle water on your Hydrangea more often than is necessary because it is receiving water through the atmosphere.

Also, making sure that you ensure that your Hydrangea is maintained within the ideal temperature will allow water to evaporate when it is required to.

Both of these aspects can stop the water from accumulating within the Hydrangeas pot, which can choke the roots and causing root decay.

8. Avoid Waterlogging

The waterlogging of the Hydrangea is a common root rot cause.

The fungus that causes root rot is attracted by humid and warm conditions. This is precisely what waterlogging of the soil causes.

The soil will become waterlogged if it isnt draining properly or if the water isnt evaporated or if youve overwatered your plants!

Be sure to water your Hydrangea at the point that you can tell that the upper one inch (2.5cm) of soil has dried. Also, ensure that the water drains properly to prevent attracting root to rot!

9. Develop Watering Schedule

A watering plan is a reliable method to ensure that youre not drowning (or submerging!) your plant.

The flowers of the Hydrangea are often prone to wilting during the summer heat It can be tempting to grab the watering container the moment you notice this taking place.

But wait! This behavior isnt indicate that your Hydrangea requires watering, but it could be a sign that youre overwatering If you give in to the urge!

The best thing you can do is create an irrigation schedule and adhere to it. Begin by watering your Hydrangea three times per week, and always at the exact time.

In the event that your top 12 inches (2.5cm) of the soil isnt dried out allow more time between the watering.

Its a fantastic method to stay consistent and ensure that the soil has the chance to dry between waterings, thereby avoiding root decay!

10. Loosen Soil

The soils loosening will increase drainage. It also helps aerate the soil.

These two factors decrease the chance of root rot forming. The loose soil gives the roots a chance air and breathe, while the drainage is better and prevents excessive water around the roots.

11. Avoid Overfertilization

Hydrangeas dont require much fertilization. They are typically content with being fertilized every year.

Utilizing too much fertilizer could cause a build-up of minerals. This could cause the development of pathogenic microflora that can causes root rot.

12. Ensure Care Requirements

Good care habits can reduce the chance of your Hydrangea developing root rot.

Hydrangeas love direct, bright sunlight and temperatures that range from 65 to 75 oF (18-24 degrees Celsius). This can encourage proper water evaporation, and ensure that the roots dont become too cold.

Also, regular watering in a regular schedule can prevent waterlogging in the soil.

In the Hydrangeas dormant phase (normally winter) it will not require watering it as often.

By following these guidelines, you can be sure you keep your Hydrangea in good condition to prevent root rot.

Frequently Asked Questions

How Do You Revive a Dying Hydrangea?

In the event that your Hydrangea is dry and brown Look for new leaf buds growing on stems. Then cut off dead stems that are above.

Remove all dead leaves. Verify if your Hydrangea has roots bound. If it is, plant it in a larger pot. Make sure to water thoroughly three times per week.

Can You Reuse Soil That Has Root Rot?

If a plant suffers from root decay the soil that it was planted in may be contaminated with fungal spores. It is not recommended to reuse the soil.

The fungal spores can cause root rot and any plant that comes in contact with the soil is susceptible to the infection. The soil must be removed.

How Do You Revive Wilted Hydrangeas?

Overwatering, underwatering or excessive heat could cause the plant to wilt. Make sure to water your Hydrangea at the time that the soils top inch is dry.

Get plenty of indirect, bright sunlight for your Hydrangea, and keep the temperature between 65 and 75 oF (18-24 degrees Celsius). The flowers will die naturally after eight weeks, and must be cut back.



Went from an inexperienced gardener to a half-decent one over 10+ years. I cover anything from general indoor plant guides and lawn care, to succulents and flowers. Super happy to share my tips and tricks with you :)