Orchids are one of the most beloved houseplants around the world. They are delicate, beautiful, and bring joy to any room they are placed in. However, orchids can also be tricky to care for, and one of the biggest challenges is dealing with fungus gnats. These tiny insects may seem harmless, but they can be deadly to orchids if left untreated. In this article, we’ll explore what fungus gnats are, how they harm orchids, and most importantly, how to get rid of them.

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What are Fungus Gnats?

Fungus gnats are small, flying insects that are commonly found in houseplants. They are attracted to moist soil and decaying plant matter, making orchids a prime target. Adult fungus gnats are black or gray in color and are typically around 1/8 of an inch long. They have long legs and antennae, and they can be quite fast when they fly.

How Do Fungus Gnats Harm Orchids?

Fungus gnats are not harmful to humans or pets, but they can be very harmful to orchids. These insects lay their eggs in the soil of orchids, and the larvae that hatch from these eggs feed on the roots of the plant. As the larvae grow, they cause damage to the roots, which can eventually lead to root rot. Root rot is a serious condition that can kill an orchid if left untreated.

In addition to causing root rot, fungus gnats can also transmit diseases to orchids. Some of these diseases are fatal, while others can cause stunted growth and yellowing leaves. If you notice that your orchid is not growing properly or its leaves are turning yellow, it may be a sign that fungus gnats are present.

How to Get Rid of Fungus Gnats

Getting rid of fungus gnats can be a bit tricky, but it’s not impossible. Here are some methods that you can try to get rid of these pests:

1. Let the Soil Dry Out

Fungus gnats love moist soil, so allowing the soil in your orchid to dry out can be an effective way to get rid of them. You should avoid overwatering your orchid and only water it when the top inch of soil is dry. This will not only help to get rid of fungus gnats, but it will also help prevent root rot.

2. Use Sticky Traps

Sticky traps are a popular and effective way to get rid of fungus gnats. These traps are made of a sticky material that attracts the insects and traps them when they land on it. You can purchase sticky traps at most gardening stores, and they are relatively inexpensive.

3. Use Beneficial Nematodes

Beneficial nematodes are microscopic worms that can be used to get rid of fungus gnats. These worms feed on the larvae of the insects and can be a very effective way to control their population. You can purchase beneficial nematodes online or at some gardening stores.

4. Use Insecticides

If all else fails, you can use insecticides to get rid of fungus gnats. However, you should be careful when using these products as they can be harmful to humans and pets. You should also avoid using insecticides on edible plants.

Preventing Future Infestations

Once you’ve gotten rid of the fungus gnats, you’ll want to take steps to prevent future infestations. Here are some tips to help you keep fungus gnats away from your orchids:

1. Use a Well-Draining Soil

Using a well-draining soil is one of the best ways to prevent fungus gnats from infesting your orchids. This will ensure that the soil doesn’t stay too moist, which is what attracts the insects in the first place. You can purchase well-draining soil at most gardening stores, or you can make your own by mixing perlite, peat moss, and vermiculite.

2. Keep Your Orchid Clean

Keeping your orchid clean is important to prevent fungus gnats from infesting your plant. Make sure to remove any dead leaves or debris from the plant, and wipe down the leaves with a damp cloth to remove any dust or dirt.

3. Avoid Overwatering

Overwatering is one of the main causes of fungus gnat infestations. Make sure to only water your orchid when the top inch of soil is dry, and avoid letting the plant sit in water for too long.

4. Use Hydrogen Peroxide

Hydrogen peroxide can be used to prevent fungus gnats from infesting your orchids. Mix one part hydrogen peroxide with four parts water, and water your orchid with this mixture. This will help to kill any larvae in the soil and prevent future infestations.


Fungus gnats can be a major problem for orchid growers, but they can be dealt with effectively. By using the methods outlined in this article, you can get rid of fungus gnats and prevent future infestations. Remember to keep your orchid clean, avoid overwatering, and use a well-draining soil. With a little bit of care and attention, your orchid can thrive and bring joy for years to come.

Here are some Amazon products that would complement Orchid Care:

  1. Orchid Potting Mix: A high-quality, well-draining potting mix specifically designed for epiphytic orchids, such as Sun Bulb Company Orchid Brown Bark.
  2. Orchid Fertilizer: A balanced, water-soluble orchid fertilizer to ensure your Aeranthes Grandalena gets the nutrients it needs, like Miracle-Gro Orchid Food Mist.
  3. Humidity Tray: A tray filled with pebbles and water to help maintain humidity levels around your orchid, such as a Humidity Tray.
  4. Small Clip-On Fan: To provide the gentle air circulation needed by Aeranthes Grandalena, consider the Genesis 6-Inch Clip-On Fan.
  5. Humidity Monitor: A digital hygrometer to help you monitor the humidity levels in your orchid’s environment, such as the ThermoPro TP50 Digital Hygrometer.
  6. Insecticidal Soap or Horticultural Oil: To control common orchid pests, a product like Bonide All Seasons Horticultural Oil can be useful.

These products will help you provide the proper care for your Aeranthes Grandalena orchid, ensuring its health and beautiful blooms.

FAQs About Orchid Care

How often should I water my orchid?

The frequency of watering an orchid depends on several factors such as the type of orchid, the potting mix, and the humidity of the environment. In general, most orchids should be watered once a week or when the top inch of the potting mix is dry to the touch. However, it’s important not to overwater the orchid, as this can lead to root rot.

What kind of light do orchids need?

Orchids need bright, indirect light to thrive. They should be placed near a window that receives filtered sunlight, or under a grow light that provides adequate light for their needs. It’s important not to place orchids in direct sunlight, as this can burn their leaves.

How do I fertilize my orchid?

Fertilizing an orchid is important to provide the necessary nutrients for growth and blooming. It’s recommended to use a balanced fertilizer with equal amounts of nitrogen, phosphorus, and potassium. Fertilize your orchid once a month during the growing season (spring and summer) and reduce fertilization during the winter months. It’s important not to over-fertilize, as this can damage the orchid’s roots.

How do I repot my orchid?

Orchids should be repotted every 1-2 years, or when the potting mix breaks down or becomes too compacted. To repot an orchid, gently remove it from its pot and carefully untangle the roots. Trim any dead or damaged roots and replant the orchid in a pot with fresh potting mix. It’s important not to bury the orchid’s roots too deeply, as this can suffocate the plant. After repotting, water the orchid and avoid fertilizing for a few weeks to allow it to adjust to its new environment.

About Author

Hannah Anderson is a passionate garden enthusiast with over a decade of experience. She has been sharing her knowledge and expertise on this website and her articles and tips have helped countless individuals create beautiful and thriving gardens. Whether you’re a seasoned green thumb or just starting out, Hannah’s practical advice and creative ideas will inspire and guide you on your gardening journey.

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