Controlling  Gnats on your houseplants

Controlling Gnats on your houseplants

29th Nov 2023

Fungus gnats, those tiny, pesky flies that seem to appear out of nowhere, can quickly become a nuisance for indoor gardeners. At our garden center, we believe in natural, eco-friendly solutions to combat these unwelcome guests. By employing a combination of preventive measures and natural control methods, we've successfully kept fungus gnats at bay in our nursery environment and plant collection. In this blog post, we'll share our tried-and-true methods for controlling fungus gnats, ensuring healthy and thriving houseplants.Preventive Measures: A Solid Foundation

  • Healthy Plants Start with Healthy Soil: One of the most common ways fungus gnats find their way into our homes is through contaminated soil. Over-watering and poor drainage can create the perfect environment for these pests to thrive. At our garden center, we advocate for well-draining soil mixes that promote healthy root growth and deter fungus gnat infestations.
  • Gnat Off: A Natural Barrier: Gnat Off is a fantastic natural-based top dressing that forms an impenetrable layer of neem granules and pumice. This barrier prevents eggs from hatching and emerging, and also deters adult gnats from laying their eggs. It's a game-changer in our fight against fungus gnats.

Natural Control Methods

  • Neem Oil as a Soil Drench: Neem oil is a powerful, natural plant extract known for its insecticidal properties. When used as a soil drench, it can effectively kill larvae in infected soil. It's gentle on plants while being tough on gnats whist also containing fungal properties to assist in your plants recovery. This is however applied as a soil drench as directed on the concentrated solution.
  • Ubloomd Sticky Traps: These adorable, sticky traps are a recent addition to our arsenal against fungus gnats. Placed strategically around infected plants, they attract adult gnats which become stuck to the green sticky disk ,preventing these adult's from laying more eggs. These traps are not only effective but also a charming addition to any indoor garden however for best results we recommend using as an integrated pest control.
  • Diatomaceous Earth: Food-grade diatomaceous earth is a safe and natural powder that can be sprinkled on the soil surface. It works by dehydrating the larvae, ultimately leading to their demise. It's an eco-friendly alternative to chemical insecticides.
  • Cinnamon Dusting: Cinnamon, a kitchen staple, can also be a potent weapon against fungus gnats. Sprinkling a thin layer on the soil surface acts as a natural deterrent. Plus, it adds a pleasant fragrance to your indoor garden whist having fungal properties which are believed to aid in root disease.
  • Vinegar Traps: Vinegar traps are an effective way to catch adult gnats. Here's a simple recipe you can try however we do recommend the additional Ubloomd traps be used in conjunction with this low toxic control

Here's a simple recipe for making your own vinegar trap, which is often used to attract and catch common household pests like fruit flies or gnats:


  • Apple cider vinegar (or white vinegar)
  • Dish soap
  • Plastic or glass container
  • Plastic wrap or a small plastic bag
  • Rubber band or string


  1. Select a Container: Choose a small plastic or glass container with a narrow opening, such as a jar or a cup. The idea is to create a funnel-like shape to trap the insects.
  2. Pour Vinegar: Pour about 1/2 to 1 cup of apple cider vinegar (or white vinegar) into the container. Fruit flies are attracted to the sweet smell of vinegar.
  3. Add Dish Soap: Add a few drops of dish soap to the vinegar. The soap breaks the surface tension of the vinegar, causing the flies to sink and drown when they come in contact with the mixture.
  4. Cover the Container: Cover the container with plastic wrap or a small plastic bag. Secure it in place with a rubber band or string, ensuring that it forms a funnel shape pointing downward into the container.
  5. Poke Holes: If using plastic wrap, poke small holes in it using a toothpick or a fork. The holes should be large enough for the fruit flies to enter but not so large that they can easily escape.
  6. Place the Trap: Put the trap near areas where you've observed fruit flies or other flying pests. Common places include near fruit bowls, kitchen counters, or trash bins.
  7. Monitor and Empty: Check the trap regularly. You'll likely find it filled with trapped insects. Empty the container and replace the vinegar mixture as needed.

This homemade vinegar trap is an effective and natural way to control fruit fly or gnat infestations in your home. Adjust the size of the container and the amount of vinegar based on your needs and the size of the affected area.


By implementing a combination of preventive measures and natural control methods, you will be able to successfully keep fungus gnats in check at your home. Healthy plants start with healthy soil, and incorporating natural barriers like Gnat Off, along with tried-and-true remedies like neem oil and sticky traps, ensures that your houseplants will thrive. Additionally, using food-grade diatomaceous earth, cinnamon or vinegar traps provides eco-friendly alternatives for effective fungus gnat control. With these strategies in place, you can enjoy a pest-free indoor garden that flourishes with vitality and beauty. Happy gardening!

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At Harmony Garden Centre, we acknowledge and recognise that we operate on the traditional land of the palawa people. We pay our deepest respect to the Tasmanian Aboriginal Community and their elders past and present. We extend this respect to all First Nations people around this Country.