Diatomaceous Earth Powder for Fungus Gnats
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Struggling with fungus gnats in your houseplants? Diatomaceous earth is a natural and effective way to control larvae in the soil and protect your plants. When applied correctly, it helps break the lifecycle of fungus gnats and keeps your terrariums and plant pots pest free.
This fine powder works by dehydrating soft-bodied pests like fungus gnat larvae, helping reduce infestations without harsh chemicals. It is ideal for houseplants, terrariums and indoor growing setups.
Why you’ll love it
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100% food grade amorphous silica
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Targets the soil stage of fungus gnats
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Also helpful around pots for slugs and at the soil line for root mealybugs
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Packed in a resealable zip bag to keep it clean and dry
Best for
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Breaking the fungus gnat life cycle in the top layer of houseplant soil
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Creating a dry barrier around pots kept indoors or under cover for slugs
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Intercepting root mealybug crawlers at the soil line during repotting
Struggling with fungus gnats in your houseplants? Diatomaceous earth is a natural and effective way to control larvae in the soil and protect your plants. When applied correctly, it helps break the lifecycle of fungus gnats and keeps your terrarium or plant pots pest free.
How does Diatomaceous Earth work?
Diatomaceous Earth is a naturally occurring sand extract that forms over millions of years. It has a high silica content that absorbs lipids and fats from the waxy outer layer of the exoskeletons of many species of insects. This kills the fungus gnat and keeps your plants happy.
Notes: DE acts as a desiccant and abrasive. It works only while dry and undisturbed.
Does diatomaceous earth kill fungus gnats?
Yes, it helps control fungus gnat larvae by dehydrating them when they come into contact with the powder.
Is diatomaceous earth safe for houseplants?
Yes, when used correctly on the soil surface it is safe for plants and commonly used in indoor plant care.
How long does it take to work?
You may start to see improvement within a few days, but full control depends on consistent application and breaking the gnat lifecycle.
Why use diatomaceous earth?
✔️ Natural pest control for fungus gnats
✔️ Helps target larvae in the soil
✔️ Suitable for houseplants and terrariums
✔️ Easy to apply and long-lasting
✔️ Chemical-free solution
Diatomaceous earth must be dry to work effectively, so it is best used on the surface of slightly dried soil. It can also help with other pests such as root mealybugs and slugs.
How to use
Let the top 1 to 2 cm of soil dry out. Lightly dust a thin, even layer over the soil surface and around the inner rim and drainage holes. For problem areas, gently work a small amount into the top layer of soil. Reapply after watering once the surface has dried again.
Important
Always apply when dry, as moisture reduces effectiveness. Avoid heavy application directly on delicate roots.
Quick Care Guide
☀️ Light: Not required for use
💧 Watering: Apply to dry soil surface
💦 Humidity: Works best in drier top layers
🌱 Tip: Combine with good watering habits to prevent fungus gnats returning
We’re still working on the most helpful FAQs for this product. Please check back soon or get in touch if you have any questions!
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4 reviews for Diatomaceous Earth Powder for Fungus Gnats
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We’re a small family business with a big love for plants.
From our base in Aberdeen, we pack every order with care and love. Our small size means we can be flexible with special requests, and we’re always happy to help. We reuse packaging, craft our own eco-friendly products, and offer friendly advice whenever you need it.
Excellent for pest control. I heavily dust and mix on the top of the soil, then mix some with water for extra penetration.