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How to get rid of ZZ plant black spots on stem

How To Get Rid Of ZZ Plant Black Spots On Stem 

Looking to get rid of pesky ZZ plant black spots on stem? Check out our easy-to-follow guide for tips and tricks to have your plant looking healthy again in no time!

ZZ plant black spots on stem is one condition that causes most gardeners to wonder what is happening to their plants. Their care can be a little tricky if you don’t know what you’re doing. These plants have broad, waxy leaves and other common names include ZZ Plant, Mother-in-Law’s Tongue, or Snake Plant.

Black spots on your ZZ may indicate the presence of a fungus called Bacterial Soft Rot. This fungus is contracted through excessive moisture. Read on to learn about the steps you can take to get rid of the black spots and keep your plant healthy and happy.

What Are Black Spots On A ZZ Plant?
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The black spots on a ZZ plant stem are called galls. These spots are caused by the same fungus that causes powdery mildew, but in this case, it is the opposite end of the life cycle. The galls are formed when the fungus infects the plant stem. They are not dangerous to your plants, but they can be unsightly if you have them.

Galls can be small or large, and appear on the upper side of the plant stem. They can be white or yellowish in color. Some of them may look like a ball, while others may be more like a cup shape.

What Are Black Spots On A ZZ Plant

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What Causes Black Spots On A ZZ Plant?

Black spots are probably due to nutrient deficiency. Your soil might be too acidic or too alkaline. You can test it by adding 1/2 cup of baking soda to one gallon of water. If it takes more than 10 minutes for the solution to turn clear, your soil is too acidic. If it takes less than 5 minutes for the solution to turn clear, your soil is too alkaline.

A black spot on a ZZ plant can be caused by a number of things, such as a

  • Fungal Infection – this is usually spread by spores and can be a problem if the plant is in a humid environment.
  • Bacterial Infection – this can be brought on by excessive use of water, poor air circulation and lack of light.
  • Moulds – these are usually associated with damp or humid conditions, but they can also occur naturally in certain environments.
  • Spider Mite Infestation – these are small spider-like creatures that feed on the foliage and often leave a blackish stain. They can be easily removed by carefully brushing the plants.

If you are using potting soil, make sure it has adequate nitrogen, phosphorous, potassium, and magnesium. Do the spots go away? Yes. If you give your plant an occasional dose of fertilizer, the spots should disappear within 2 to 3 weeks.

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How To Fix ZZ Plant Black Spots On Stem?

Here are several ways to fix ZZ plant black spots on stem:

  • Keep your Plant in a Well-ventilated Area.  The ZZ plant can be affected by dampness, which causes rot and fungal disease. Do not over-water your plants. Overwatering will cause the roots to rot, and it can lead to fungal diseases such as black spots. Give your plant a bright light.
  • Spray Fungicide on the Affected Stems. Keep the affected plant in a shaded area for a few days. Soak the stems with fungicide or spray them.
  • Stop Misting your ZZ Plant Leaves.  This will cause the stem to dry out, which is causing the black spots to form. Keep misting only the top leaves. The rest of the plant should be well-watered.  Use a water repellent spray on the black spots to prevent them from forming.
  • If Growing in a Pot, Keep the Soil Dry. If growing in soil, add mulch or bark chips to prevent soil from drying out. If growing in a pot, water only as much as necessary to prevent the roots from becoming dry. If growing in soil, keep the soil moist and fertilize regularly.  The fungus develops in wet soils so ensure you keep your potted plant dry but moist.
How To Fix ZZ Plant Black Spots On Stem
  • Move your Plant to a Shaded Area –  Move your plant to a cooler location as it does not like direct sunlight. Keep it away from natural sunlight in a shaded area where it will thrive.  The black spots on the stems will not disappear immediately but with time they will all do.  Be sure to keep the humidity not too high.
  • Limit the Times you Water your Plant- Watering your plant is a must but don’t overwater.  You may want to use a moisture meter to determine how often you need to water your plant.  Use a timer and only water during the day if that’s what your plant needs.  Use a fertilizer-  Fertilizer can help plants grow and it helps to keep your plants healthy.  It also helps to keep your plant looking healthy.  You may want to buy a fertilizer that specifically has zinc in it.

Prevention Tips For A ZZ Plant Black Spots On Stem

A ZZ plant is a very popular indoor houseplant, but it can have a few problems. Black spots are one of the most common issues that ZZ plants can suffer from. The good news is that most of these spots can be easily and quickly fixed.

If you have black spots on your ZZ plant, you’re not alone. The good news is that most of these problems can be prevented if you pay attention to a few simple steps. Here are some tips on how to prevent them in the first place, and then how to fix them when they happen.

  • Keep your ZZ plant away from direct sunlight You may have heard that sunlight can cause ZZ plants to have black spots.
  • When you water your ZZ plant, make sure you don’t get water on the leaves or foliage. It can cause damage and discoloration.
  • If you notice brown leaves on your ZZ plant, don’t panic. It’s not a problem. Just keep an eye out for it.
  • If you do see some brown leaves on your ZZ plant, then it’s time to give it a little extra care.
  • Don’t fertilize your ZZ plant. If you do, it will cause the leaves to yellow.
  • Don’t let your ZZ plant get too cold. If it gets below freezing, it can get sick and die.

Final Thoughts

It is common to see ZZ plant black spots on stem but the good thing is they can be taken care of as early as to make them disappear.  Try the above steps today and let us know what works for you.


What do black spots on plant stems mean?

The term "black spot" can refer to any type of injury or disease, such as the black lesions caused by Botrytis cinerea, or to the so-called chlorotic streaks.  The ZZ plant brown spots on leaves are such black spots on plant stems.

Do ZZ plants turn black?

The ZZ plants may turn back on the stems if they completely rot and are about to die.

Read more about Why Is My Zz Plant Not Growing – 5 Slow Growth Fact Of The Zz Plant