African Violet Root Rot: Causes, Symptoms, and Treatment

Nov 06, 2025 0

African violets are a popular houseplant because of their vibrant blooms and ease of care. But even with careful attention, African violets can suffer from crown problems. African Violet crown or root rot is a problem that can affect your plant and it can happen rather quickly. If you see these symptoms in your African Violet, it’s best to investigate and fix the problem as soon as possible.

Understanding Root Rot

Root rot on African Violet plants can unfortunately occur when we are overzealous with watering African Violets. Over-watering can permanently damage African Violet roots and lead to the plants death. While most African violets don’t develop root rot, the disease can cause an African violet to die if not treated soon enough. Identifying African Violet Root vs. Root rot and stem rot can appear similar in African violets. Root rot, which is caused by the fungus Cylindrocarpon, starts in the roots. In the early stages, both root rot and stem rot can result in the leaves becoming pale and plant growth slowing down. However, if you look closely, it’s possible to distinguish root rot from stem rot. Both diseases are caused by fungus, and both can kill an African violet. Root rot has time to progress before symptoms become visible in the foliage. In the beginning stages of root rot, an African violet’s leaves will lose color, appearing yellow or gray. As the disease worsens, the leaves will begin turning black or brown. It’s more likely you’ll notice symptoms above the soil line before you notice the damage to the roots. Unlike other types of rot in African violets, it’s possible to treat root rot.

What Causes Root Rot?

Root rot is caused by a fungus, but certain conditions allow the fungus to develop and affect your African violets. Being aware of the conditions that cause root rot will allow you to better prevent root rot from occurring in the first place. There are several things that can cause crown problems in African violets.

Overwatering: The most common issue leading to root rot is watering. Don’t water your African violet more often than it needs to be watered, and make sure that whatever container you use for your African violet has adequate drainage to allow excess water to escape. Allow the soil to almost dry out before watering again. Always check to see how dry the soil is before watering. Usually an over-watered plant can lead to root rot. If the soil mixture in which the African Violet is planted, is too dense, then the water can clog up the roots and not drain out easily. This overtime can lead to root rot.
Soil Conditions: The soil also plays a role in creating the wet, soggy environment that allows root rot to develop. Soil used for African violets needs to be quick-draining. For this reason, we recommend using potting soil designed specifically for African violets. An African violet soil mix is typically lighter and allows water to move away from the roots quickly.
Temperature Fluctuations: Drastic changes in temperature can play a role in the development of root rot as well. If the temperature is too cold or too hot, this can damage your African violet, including the roots. Heat can also lead to root rot. If the plant environment is too hot during the day and cold at night, this change in temperature can affect the roots of the plant. If the evenings are cold, and plants are watered in the evenings, this can cause root rot, as the cold water can shock the roots. During the hot summers, the soil can dry out fast and even with diligent watering, the fast drying out of roots can lead to root rot.
Stressful Environments: Root rot can also occur if the plant is exposed to a stressful environment of changing soil conditions. Since stress weakens your African violet, it can contribute to root rot as well. Try to keep conditions as consistent as possible to keep damage from occurring to your African violet’s roots. If the soil undergoes a cyclic change in moisture conditions, with first too dry soil, then over watering, then again allowing the soil to dry out again it can lead to root rot. These changes of dry/wet/dry soil are too stressful for the roots, leading to a weaker root system and eventually root rot.
Poor Drainage: African Violet plants need adequate drainage, if they are planted in pots with limited or no drainage, root rot will occur.
Pathogens: Cause Pythium ultimum, a fungus-like organism that is a common soilborne pathogen. It survives unfavorable periods in soil and infected plant debris. Under favorable conditions, such as cooler soil-media temperatures, spores germinate and infect roots. Movement of infected plants and/or soil can spread this fungus-like microorganism.

Symptoms of Root Rot

The problem is caused by a fungus that attacks the roots and crown of the plant. This can cause the leaves to turn yellow and fall off, the stem to rot, and the flowers to wilt.

The leaves will seem to droop down and the leaf stems of the bottom leaves will become brown and mushy. The leaves may also become mushy.
The leaves will start to seem faded in color. The leaves will not be firm, but soft and droopy to touch, seem wilted in appearance.
Plants suddenly wilt and die. Sometimes only the lower leaves and petioles become necrotic and dry.
Plants are easily separated from the pot and media when the crown has decayed.

Diagnosing Root Rot

First when you remove the plant from the pot, if the soil is wet, along with mushy leaves, that’s a first tell tale sign that root rot may be present. To see if an African violet has root rot, take a look at the roots. Decayed roots will be brown or black and feel mushy. Next, gently clear away little bit of the soil from root system, just enough to check the tertiary/secondary roots growing from the sides of primary main root stem. If they are brown in color and soft mushy to touch, then those tertiary/secondary smaller roots have root rot. The next step is to check the primary main root stem. If this feels soft and mushy to touch and looks dark brown in color, then the main primary stem is rotted from the inside too. For further inspection of the root rot, can slice off the plant stub, when the sliced off stub is dark brown in the center and around, the plant tissue is rotten.

How to save an african violet dying from root rot, comment sauver un violette de pourriture racines

Treating Root Rot

Unlike some other forms of rot, African violets can sometimes recover from root rot. If you catch root rot early enough, your plant can recover. While you can’t reverse the damage of rot in roots that have already been infected, you can prevent root rot from spreading to other roots and save your African violet. Root rot will not go away on its own. If you allow the rot to spread, the damage will eventually kill the African violet.

Fungicide	Dosage	Group
Banol	2 to 3 fl oz/10 gal water	28
Banrot 40 WP	6 to 12 oz/100 gal water	1 + 14
Mefenoxam 2 AQ	0.49 to 0.98 fl oz/100 gal water	4
MetaStar 2E	0.5 to 2 fl oz/100 gal water	4
Proplant	2 to 3 fl oz/10 gal water	28
Subdue MAXX	0.5 to 1 oz/100 gal water	4
Terrazole 35 WP	3.5 to 10 oz/100 gal water	14
Truban 30 WP	3 to 10 oz/100 gal water	14
LALStop G46 WG	0.13 oz/1 gal water	N/A

Here’s how to treat root rot:

Repot in New Soil: Since fungus in the soil causes root rot, you’ll need to repot an infected African violet in new soil to save it. Be sure to use soil that drains well; soil mix designed for African violets is best. You’ll likely need a new container when you repot. Since you’ll be removing any infected roots, your African violet probably will need a smaller container than it did before.
Remove Damaged Roots: Before placing the African violet with root rot in a new container, you need to remove any damaged roots. An African violet can usually survive as long as no more than ⅔ of the roots are removed. If you see that you need to remove more than this amount, your African violet is unlikely to be able to survive.
Proper Watering: As your African violet recovers, make sure you don’t overwater or allow water to pool up in the plant’s container. Wait until the soil is almost dry before watering again. The exact timing for watering African violets differs depending on several factors. The best way to know it’s time to water your African violet is to check the soil. If the top inch or two of soil is dry, it’s time to water.
Re-pot Clean Root Stem: When the plant is ready to be re-potted, make sure the clean root stem is re-potted in a light airy mix. For more information on African Violet potting mix, please visit our post, “African Violet Soil/Potting Mix“. This can be in a moist perlite only mix or a moist 50% peat moss+ 50% perlite mix. Make sure the soil medium is not too wet, only a moist.
Create Humid Environment: Place this repotted plant in a Ziploc bag and seal to create a humid environment. Leave for 1-2 weeks. Then only open up one side of the bag and leave for a few more days. Then open up the bag completely and leave for a few more days. This way gently acclimatize the developing plant to the outside environment. Do not suddenly expose the newly potted plant to the outside environment by immediately removing the plant from the bag. Do this step over time, otherwise the plant which was already in shock will become more in shock and the recovery process will be delayed.

Preventing Root Rot

Prevention is always the best medicine, and this is especially true when it comes to African violets. Providing good care will help your African violet recover and prevent root rot from occurring in the future. It’s also important to repot your African violet at least once a year. During this time, you’ll refresh the soil, which allows your African violet access to more nutrients. Repotting does place stress on your African violet, but it’s necessary for your plant to continue thriving. Regarding root rot, repotting is the perfect time to check for damage to the roots.Here are some tips to prevent root rot in African violets:

Water Properly: One of the most important things you can do is to water your African violet from the bottom. This allows the roots to absorb moisture without the leaves getting wet, which can lead to crown rot. African violets need to be kept moist, but not wet. Allow the soil to dry out slightly between waterings.
Adequate Lighting: Provide adequate lighting for your plants. They need bright, indirect light in order to bloom well.
Fertilize Regularly: Fertilize regularly with a balanced African Violet Plant Food specifically designed for African violets.
Deadhead: Don’t forget to deadhead your plants. This means removing spent blooms as well as any yellow or brown leaves. If you notice any yellowing or wilting leaves, it’s important to remove them promptly. These leaves can harbor diseases that can spread to the rest of the plant.
Sterilize: Sterilize rooting media and potting soil before planting. Avoid reusing pots or trays from a previous crop for propagation.
Cultural Control Methods: Best used in conjunction with cultural control methods.
Avoid Overwatering: Avoid overwatering but keep soil evenly moist by sub-irrigating (watering from below).

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