Dealing With Succulent Stem Rot (A Comprehensive Guide)

Succulent Stem Rot

So you want to learn how to save a succulent with a black stem? 

Well then, congratulations. You came to the right place!

Succulent City is your best bet for tried succulent-revival tips and tricks. 

You want nothing but the best for your lovely green ladies. We understand that. 

So when you come across icky black splotches on your succulent, we know just how confused, sad, and disheartened it makes you feel. 

These blackened areas are called stem-rot (or root-rot) and are a succulent enthusiast’s worst nightmare.

So what exactly is stem-rot? 

How do we cure it?

For the answers to this and more, visit the Succulent City Plant Lounge – meet other succulent lovers from across the globe. Read their experiences, hear their stories, and learn their remedies.

How To Save Succulent With A Black Stem-What Is Stem-Rot-SC
Stem Rot Black: IG@happy.little.succulents

What Is Stem-Rot?

It is a disease characterized by yellow, mushy leaves/stems and visible black or brown spots that manifest on the unlucky succulent. 

Stem-rot and root-rot are especially common among succulents growing in warm, humid climates.

Stem-rot refers to rot occurring on or around the stem above ground level, while root-rot refers to decay in the roots below ground level.

One thing you should know: a succulent with a visible stem rot has a 20% probability of survival, and that’s being generous!

It is better if caught early while the decay is still in the roots. However, once the rot is visible above ground, it’s already got the unlucky succulent in a choke-hold.

Losing your dear green babies to this black scourge is a terrifying thought. 

How To Save Succulent With A Black Stem-How To Treat A Succulent With Stem-Rot-SC
Succulent treatment from Root Rot: IG@plantholicmum

Follow Succulent City on Facebook, Pinterest & Instagram for more informative & interesting content about succulents & cacti 🙂 Join the discussions at our Facebook Group, “Succulent City Plant Lounge.” Happy planting, and live the moment!

Read more: What Is Succulent Root Rot & How Do You Fix It?

How Do I Know If My Succulent Has Stem-Rot?

Nine times out of ten, stem-rot usually begins below ground.

Usually caused by extra water in the soil due to over-watering or insufficient drainage, the roots get wet and slimy and start to rot. 

Remove the plant from its pot and inspect the roots if you suspect root rot as the source of your succulent’s woes. 

A healthy succulent’s roots should be firm to the touch with a light brown/tan color. Rotting roots will feel soft and mushy, and some may even crumble on contact. Infected roots have a dark, blackish hue and smell similar to rotting vegetables.

If the rot isn’t found and treated while below ground, it will climb up the root system, creeping above ground, and begin to affect the stem. 

Slowly eating away at the stem, you may notice the leaves turn an unhealthy shade of pale yellow. Should it proceed unencumbered, the lower half of the succulent will get soft to the touch and start rotting away. 

By this time, the affliction has your succulent well in its grasp. It takes a lot of effort and luck to get it free.

Also, spotting these signs on succulent stems shows what?

  • Succulent stem turning brown at the base: A stem can turn brown when it’s stressed, rotted, or aged. It could be any of the above causes. Therefore, you should inspect further! But brown is not a deadly color.
  • Succulent stem turning black at the base: It’s a root rot sign, like seeing the brown color at the base if you find it sooner. When it turns black, it’s in the terminal phase. There is also a very small chance of it being some fungal disease. But they are all deadly signs. The only way is to click here.
  • See succulent stem shriveling: It can be either overwatering or underwatering. To know the exact problem, you must inspect by following our distinctive guides for the 2 issues. Anyway, this is a sign of a problem.
  • Succulent stem turning woody: This has nothing to do with stem rot. It shows the lack of sunlight, which you should provide your succulent more often.
  • Succulent growing roots from the stem: This is what I addressed in the post about succulent roots. This is what we call “aerial root.” I have a detailed infographic for that. Check it out!

Follow Succulent City on Facebook, Pinterest & Instagram for more informative & interesting content about succulents & cacti 🙂 Join the discussions at our Facebook Group, “Succulent City Plant Lounge.” Happy planting, and live the moment!

What Causes Stem-Rot?

A couple of things could be responsible for this destructive infection. More often than not, excess moisture in the soil tends to be the culprit.

1. Over-watering 

Succulents are native to arid and semi-arid regions. They receive very little rainfall and have adapted their biochemistry to store water in their thick green leaves and stems. 

Over-watering causes the succulent to store more & more water resulting in the leaves(or stem) bursting open to release excess water. This act damages the plant tissue and exposes it to infection.

How To Save Succulent With A Black Stem-What Causes Stem-Rot-Fungi-SC
IG@agro.fito

2. Fungi

Soil-dwelling fungi may also be the chief cause of your succulent misfortune. Indeed, these parasites are the bane of succulent lovers worldwide. Phytophthora, in particular, is a mold fungus known to attack the roots. It thrives in areas of excess moisture/flooding with poor drainage. 

How To Save Succulent With A Black Stem-What Causes Stem-Rot-Sunburn-SC
Succulent-Sunburn: IG@novasucculents

3. Sunburn

Too much of anything is poisonous. Different succulents have different preferences. Sure, they might look similar, but keep one individual species in the sun for too long and will produce black spots as the leaves begin to burn. 

How To Save Succulent With A Black Stem-What Causes Stem-Rot-Pests-SC
Mealy Bug: IG@sucstu

4. Pests

Bugs like mites, aphids, and mealybugs dine like kings on succulent plants. Pay close attention to your green companion; these guys are most likely responsible if you notice small freckle-like black spots. 

How To Treat A Succulent With Stem-Rot 

At Succulent City, we believe succulent is more than a simple plant. Instead, we view it more like a little green companion – a reflection of your personality.

Time needed: 1 hour

With this in mind, we curated a list of to-dos that, if followed, should land a solid blow on the nasty rot and give your succulent a fighting chance. Here is how to treat a succulent afflicted with stem rot:

  1. Cease all watering immediately.

    Excess moisture is what got your ailing succulent here in the first place. More water will only make matters worse, sealing your plant’s fate.

  2. Take the plant out of its pot.

    Remove the old soil and wash the succulent roots under running water. You must be gentle, considering they might be rotting and ready to crumble at the slightest touch. 

  3. Chop off any part of the succulent exhibiting black/brown discoloration.

    Discard cuttings carefully to avoid contact with any other healthy plants.

  4. Be sure to use only new equipment. 

    Don’t let anything from the infected plant contact your new setup.

  5. Mix a fresh batch of quick-drain soil.

    Click on me to read an excellent article by Succulent City explaining how to DIY your succulent soil at home.

  6. Get a new planter – preferably terracotta or ceramic – and fill it halfway with soil.

    Carefully place your now-healthy succulent into the pot and fill it with soil to the brim. Ensure your planter has a drainage hole to avoid stagnant water. 

  7. Place the remaining healthy succulent in a cool, dry, well-ventilated place away from direct sunlight.

    Avoid hot & humid locations at all costs.

How To Save Succulent With A Black Stem-How Do I Know If My Succulent Has Stem-Rot-SC
Stem Rot noticed in Image: IG@grownassgrass

Follow Succulent City on Facebook, Pinterest & Instagram for more informative & interesting content about succulents & cacti 🙂 Join the discussions at our Facebook Group, “Succulent City Plant Lounge.” Happy planting, and live the moment!

Prevention Is Better Than Cure

A stitch in time saves nine – English Proverb.

More than 95% of stem rot is a result of over-watering. It’s safe to say that keeping your succulents nice and dry may help you dodge the bullet. Succulents don’t need watering every day. Twice a week should be just fine.

To my next point, always ensure your grow pot has a hole at the bottom to drain any excess water instead of leaving your succulent roots in pools of stagnant water.

Last but not least, opt for premixed succulent or cactus soil. These are porous and provide excellent drainage.

Succulent City chief editor

ABOUT ME

Succulent City

Hey everyone! Welcome to Succulent City! We are all about succulents, cacti, and a bit about air plants. Ten years back, in 2013, we began the journey with succulents. It started as a simple hobby, crafting and selling charming succulent-themed pins and decorations. But as time passed, our fascination with these remarkable plants grew, and we gained extensive knowledge about them. Therefore, Succulent City is the blog as you see it is now. Enjoy your visit and happly planting!

2 thoughts on “Dealing With Succulent Stem Rot (A Comprehensive Guide)

  1. Thanks for your helpful information. I am battling stem rot, but it can’t be from overwatering. The soil is quite poor though and clay-filled, but it seems to me that the gardens most prone to the disease are the driest. In any event, what succulents are most resistant to stem rot? My aeonium arborescens seem especially sensitive as do my “green chalk” (senecio) but my aloe nobilis and other aloes and agaves seem impervious. Any advice on what to plant where I’ve pulled up an infected stem rotted plant?

    1. It’s true that you said more than just overwatering gets your plant some stem rot. For me, overwatering can kill all succulents. No succulents are more resistant than the others speaking of overwatering 🙂 The only way is to pay attention to the watering schedule. However, letting your soil too dry can lead to underwatered succulents, which can also lead to stem rot. In this case, I think you have underwatered succulents. Not that Aeonium arborescens or Senecio “Green Chalk” are less resilient. They are real fighters 🙂
      For Aloes and Agave, it seems to be more resilient because of their stem & rosette structures. The stem is underground, near the root, connected to rosettes so it’s away from ground diseases. However, it’s easier to get stem rot when you pour water into the center of the plant.

Leave a Reply

Your email address will not be published. Required fields are marked *

This site uses Akismet to reduce spam. Learn how your comment data is processed.

Posted in