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Watch out for these signs of root rot in your plants

Every gardener wants their plants to be healthy and thriving. There are pests and diseases to look out for, but most of those affect plants above the ground, which makes them somewhat easier to spot, prevent, and treat. What about your plant’s roots, though? Don’t let root rot be out of sight, out of mind! Here is everything you need to know about root rot, from the earliest warning signs to all of your treatment options.

What is root rot?

Root rot is, as the name suggests, when the roots of a plant begin to rot and decompose before the plant is dead. There are two main causes of root rot, and, although there is some overlap in symptoms and preventative measures, your treatment options may be slightly different.

The first cause of root rot is overly damp soil. Standing water or poor drainage leads to soil that is too wet. Roots sitting in this soil won’t be able to absorb air, essentially drowning. The second cause of root rot is a fungal infection. This begins in a similar manner, since fungi grow in moist soil. However, fungi don’t need the soil to be as moist for as long as it takes for the first cause of root rot.

What are the warning signs?

Of course, a major sign of root rot is if your plant’s roots are rotting. However, unless you have a hydroponic or air garden, there’s a good chance you don’t have an easy way to see your plant’s roots, which unfortunately makes root rot difficult to detect. Often the first signs of root rot you’ll notice are wilting, yellow leaves, squishy or mushy stems, and slower development, sometimes accompanied by a rotten smell coming from the soil. These signs indicate significant damage to the plant, which may be irreversible.

You can keep an eye out for water pooling around your plant, either after heavy rain or due to poor drainage. Look for signs of fungal growth near your plant, as that can be a signal that your soil is too moist and home to fungus spores. If one of your plants shows signs of root rot, it’s best to check any surrounding plants as well.

Reddish brown roots rotting

Preventing root rot

Since root rot is so difficult to spot, it’s especially important to take preventative steps. Before planting your garden, test your soil to see how quickly it drains. If your soil is slow to drain, you can reduce the risk of root rot by planting water-loving plants like irises or scarlet swamp hibiscus. You can add some sand or gravel into the soil to help it drain faster, but be sure to mix it in thoroughly. If you notice water pooling around your plants, you may want to transplant them to a new location, to be safe.

For potted plants, be sure there are enough drainage holes in the pot and plant them in fresh, unused soil. Avoid overwatering your plant. When you’re picking out seedlings, whether for a container garden or a yard garden, check the plant’s roots before taking them home. The roots should be white or green, although they may look very light brown, due to the dirt. The roots shouldn’t be dark brown or red, and they should smell fresh, not rotting.

Unpotted plant on wood
Image used with permission by copyright holder

Treating root rot

If the root rot has taken over a significant portion of the root system, then there isn’t much you can do in the way of treatment. In most severe cases of root rot, where the aboveground portion of the plant is already affected by it, the plant is unable to recover. However, if you catch the root rot early, there may be some hope.

Firstly, transplant the plant carefully to drier soil. Choose the new location carefully to avoid a repeat. If the root rot was caused by a fungal infection, then a fungicide might be able to help. Gently removing the infected roots can give your plant a better chance of recovering. Be sure to thoroughly sanitize any tools you use, or else you could spread fungus spores to other plants when you use them next.

Root rot can be devastating for any plant, but by using these simple tips, you can stop it from taking over your garden. It may seem like it’s just rotten luck, but knowing that root rot is caused by overly moist soil can help keep your garden healthy. Preventing root rot is much easier than treating it, but don’t give up! Catch it early and you may be able to save your plants.

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Cayla Leonard
Cayla Leonard is a writer from North Carolina who is passionate about plants.  She enjoys reading and writing fiction and…
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