Snake Plant Root Rot: How To Save Rotting Snake Plants

Snake plants are about as forgiving as houseplants get. They shrug off low light, dry air and a missed watering or three. But there’s one problem that can take them down: root rot.

Due to overwatering, root rot is a common affliction of snake plants. In fact, overwatering is the quickest (and sometimes the only) way to kill a sansevieria.

A quick name note before we dig in. Genetic research moved snake plants from the genus Sansevieria into Dracaena, so you’ll see them listed as Dracaena trifasciata. The group is still widely called sansevieria, and the care is the same either way. For everyday care, see our guide on how to care for your sansevierias.

The good news? Root rot is mostly a watering and drainage problem, so it is mostly preventable. And if you catch it while some roots are still healthy, you have real options. Here’s how to spot it, what to do about it, and how to keep it from coming back.

What Causes Snake Plant Root Rot?

Root rot is a disease, not just “too much water.” The University of Wisconsin–Madison Extension explains that a large number of soil-borne fungi cause it, with Pythium, Phytophthora, Rhizoctonia and Fusarium the most common. Clemson Cooperative Extension names a similar group. The key point: “Most root rot fungi prefer wet soil conditions.”

So the real cause is soil that stays wet. Snake plants are succulents that store water in their thick leaves, and their roots don’t want to sit in soggy mix. As University of Illinois Extension puts it, wet soils favor root rot “because they leave little space for air to get to the roots.”

Iowa State University Extension lists the usual ways a pot stays wet:

• Watering too often. Water before the soil has dried out and it never gets the chance to.
• No drainage holes. Water has nowhere to go.
• Water left in the saucer or outer pot. The plant ends up standing in it.

Two more causes come up again and again in the sources. One is a pot that’s too big. The Royal Horticultural Society warns that a much larger pot holds a lot of spare compost that tends to “stay damp after watering, encouraging root rot.” The other is the soil itself. Garden soils often contain root rot fungi, and used potting mix, or water that drained from your plants, can carry them too.

Signs Of Root Rot In Snake Plants

Root rot happens below the soil line, so the first clues show up in the leaves. Here’s what the extension sources describe:

• Yellow, collapsing leaves. If plants stay wet, root rot develops, causing leaves to turn yellow and collapse, eventually leading to plant death.
• Wilting while the soil is wet. Gardeners often notice root rot when a plant is wilted, even though the soil is wet.
• A plant that leans or wobbles. If the whole plant is leaning over, not just the occasional leaf, check for root rot. A healthy plant’s rosette should be firmly anchored in its pot.
• Dark, soft crown or roots. University of Maryland Extension lists browning or blackening of the crown and roots, along with poor growth.

The surest test is to look. Slide the plant out of its pot. Rotted roots are soft and brown, and they may have a bad odor. Pythium-rotted roots are brown to black and soft or mushy, and the outer layer pulls away easily, leaving a thin thread behind.

One caution: wilting from too much water can look a lot like thirst. Overwatering can also cause wilting, and it’s easy to mistake this for a lack of water. Before you reach for the watering can, check the soil and the roots.

Look-Alikes Worth Ruling Out

Not every collapsing snake plant has root rot. Vine weevil grubs feed on the fleshy roots and cause the leaves to collapse. Blackened leaves, leaf droop and whole-plant collapse are signs of cold damage, often seen in unheated rooms over winter. If the roots look firm and healthy but the plant still flops, those are worth a look.

How To Save A Snake Plant With Root Rot

Let’s be honest about the odds first. Often the best and most cost-effective way to deal with a houseplant with root rot is to throw it out, and plants rarely recover from it. But a snake plant with only some roots damaged is a different story. If only a few roots are infected, cut out these roots and repot the plant in sterile soil.

So the size of the damage decides your next move. Here’s the rescue, step by step.

Step 1: Unpot And Inspect

Ease the plant out of its pot and shake or gently rinse away the old soil so you can see the roots and the base of the plant. Healthy tissue is firm. Rotted roots are soft, mushy and brown to black. Snake plants are poisonous and the sap is a skin irritant, so wear gloves for this job.

Step 2: Cut Away The Rot

Use clean, sharp scissors or a knife to cut out every soft, rotted root. Then deal with the leaves. Remove a damaged leaf by cutting it off at the soil level, at the base. Mouldy, shrivelled, completely brown or completely yellow leaves won’t recover, so cut those off, but keep leaves that are mostly green.

Clean your tools when you’re done. Disinfest tools, work surfaces and clay pots after working with plants that have root rot, using a 10% bleach or detergent solution, or alcohol.

Step 3: Repot In Fresh Mix And A Clean Pot

Don’t put the plant back into the old, wet soil. Use a pasteurized commercial potting mix, not garden soil, and don’t reuse potting mix from your houseplants. A well-drained potting soil, such as cactus mix or potting soil amended with perlite, is best. More on mixes in our guide to snake plant soil.

Next, the pot. Choose one with drainage holes, sized close to the root ball: 1 or 2 inches larger in diameter, or only slightly larger, to avoid the damp spare compost that encourages rot.

If you want to reuse the old pot, clean it first. Scrub pots clean and rinse them in one part bleach to nine parts water before reuse. Plastic is another story: don’t reuse plastic pots after root rot, because they are often difficult to disinfest.

And skip the gravel. Don’t put rocks or gravel in the bottom of the pot. The idea that gravel improves drainage is a myth: water “perches” in the soil just above the gravel instead of draining straight into it.

Step 4: Go Easy On Water While It Recovers

The advice for a plant you decide to keep, in capital letters: “REDUCE SOIL MOISTURE!” Provide enough water to prevent drought stress, but don’t overwater.

What about the first watering after repotting? I wait a few days before the first watering. The snake-plant sources read here don’t give a rule for this, but cactus guides say the same: UF/IFAS Gardening Solutions says to “wait a few days before you water the first time,” and Colorado State University Extension says not to water immediately after repotting because it makes cacti more susceptible to diseases. A snake plant is also a succulent, so a few dry days is a reasonable start.

After that, water only when the soil has dried out. Keep the plant in bright, indirect light and out of direct sun, as it can burn. Hold off on fertilizer until you see new growth. That last one is a practical tip, not an extension rule.

When The Roots Are Mostly Gone: Save The Leaves

If the base and most of the roots are mushy, the plant itself is probably lost. Throw away severely infected plants and only take stem cuttings from healthy tissue. With a snake plant, that means its leaves.

The leaf-section method works like this:

• Remove a healthy leaf and cut it into 3- to 4-inch-tall sections.
• Keep track of which end was closer to the base; that end goes down. Cut a notch in the top so you remember.
• Dip the bottom end in rooting hormone and insert it one to two inches deep into a moistened rooting medium.
• Give it warmth, bright indirect light and high humidity. New shoots or plantlets should appear at the base in two months.

One catch: variegated-edge cultivars such as ‘Laurentii’ lose their variegated coloration when propagated by cuttings. If the plant has healthy sections at the base, dividing is the way to keep the pattern. Split a clump and discard any damaged or dead sections, repotting only healthy ones.

What About Fungicides, Bleach Dips And Home Remedies?

It’s tempting to reach for a product. The sources aren’t enthusiastic. Chemical fungicides aren’t recommended for root rot on houseplants, because few products are available to home gardeners and those that are tend to be expensive. Most indoor gardeners will find these chemicals probably cost more than a new plant.

You’ll also see advice to soak the roots in a bleach solution, or dust them with cinnamon, sulfur or mycorrhizae. None of the extension sources above recommends any of these for treating snake plant roots. Bleach, in those sources, is for cleaning tools and pots, not for soaking plants.

Hydrogen peroxide comes up a lot too. Whatever else you try, drainage and watering come first.

How To Prevent Snake Plant Root Rot

Prevention is mostly about keeping the soil from staying wet. These habits come straight from the sources:

• Water only when the soil is dry. Water only after the soil has completely dried out. Push your finger into the compost to check, rather than watering routinely.
• Water even less in winter. NC State Extension says to water only every one to two months in winter. Plants barely need any water then unless they’re in a particularly warm spot.
• Empty the saucer. Pour away any water that drains into the saucer or outer pot.
• Keep water out of the center. Missouri Botanical Garden says not to pour water into the center of the rosette.
• Use a pot with drainage holes and a gritty mix. Penn State Extension says to choose a cactus potting mix or one with perlite, and only containers with drainage holes.
• Don’t overpot. Repot into a pot only slightly larger.
• Start clean. Use fresh, pasteurized commercial mix, not garden soil or old mix. Buy plants from a reputable source and make sure they’re free of root rot before you buy. Pick a plant whose rosette is firmly anchored and doesn’t wobble.

A Note On Safety

Rescue work means handling cut leaves and sap. The sap is a skin irritant and sansevierias are poisonous, so keep them out of reach of children and pets. The ASPCA lists the snake plant as toxic to dogs and cats, naming saponins as the toxic principle. The plants are mildly toxic to humans and pets. Wear gloves, and bag up the trimmings where pets can’t get them.

The Bottom Line

Root rot is one of the few things that can really take down a snake plant, and it starts with soil that stays wet. Catch it early, cut out the rot, and give the plant fresh mix in a clean pot with drainage holes. If it’s too far gone, save a few healthy leaves and start over. Then water only when the soil is dry.

Have you ever brought a snake plant back from root rot? Tell us what worked for you in the comments.