Diatomaceous earth—also called DE, diatomite, kieselguhr, or kieselgur—can repel slugs and snails when dry, as they tend to avoid crawling over it.
However, some slugs and snails will cross it anyway, and once it becomes wet, it loses its effectiveness entirely.
In addition, DE acts as an insecticide that can harm bees and other beneficial insects, and it carries certain health risks.
For these reasons, there are far safer and more effective natural alternatives for controlling slugs and snails.
What is Diatomaceous Earth?
Diatomaceous earth (DE) is a sedimentary rock powder that consists of fossils.
Basically, it contains the shells of tiny diatoms, fossilized sea organisms that lived millions of years ago.
Chemically, DE is pure silicon dioxide (SiO2), which is non-toxic to humans.
The powder is abrasive because the broken shells have many sharp edges.
One teaspoon of diatomaceous earth contains more than a billion tiny pieces of shell.
These pieces cut insects’ skin and absorb their moisture. That is why DE has a biocidal and insecticidal effect.
It is used as a natural pest control against all types of insects; for example, mites, cockroaches, and ants.
Does Diatomaceous Earth Kill/Repel Slugs & Snails?
Some people believe that DE might kill slugs and snails in the same way as it works against insects.
This is incorrect.
Slugs and snails are protected against the sharp edges by their mucus.
However, they dislike crawling over DE, as the following experiment shows:
Video: Diatomaceous Earth and Slugs – Test
The beginning of the video demonstrates that some slugs crawl over DE without hesitation.
Most of the time, however, they prefer not to move over DE.
That is why many people recommend its use as a natural remedy against slugs.
Peaceful Slug Control & Plant Protection
 |  |
| Slug Repellent Copper Tape | Slug Collars | Multipack |
| View on Amazon | View on Amazon |
| or on eBay | or on eBay |
How to Use DE Against Slugs?
Diatomaceous earth – food grade – is used to form protective circles around threatened plants and beds.
After rain, irrigation, or other forms of moisture, the protective ring must be renewed.
During application, you should wear gloves, respiratory protection, and goggles to prevent health risks.
This is because diatomite, inhaled as dust, can lead to respiratory diseases and can even be carcinogenic.
In case of eye contact, flush your eyes out thoroughly and consult a doctor.
Also, to protect children, it is important to store diatomaceous earth in places that are always inaccessible for them.
In most states, it is forbidden to dispose of diatomaceous earth in the sewer. Instead, you should take it to a recycling center.
Products & Price
Diatomaceous earth is available in different varieties.
The type also depends on the region where it is mined. Every area produces a different mixture of diatoms and shell forms. Some are sharper than others.
In addition, preparation and intended use differ.
Never use ‘pool filter grade’ DE, as it carries particularly harmful health risks if you inhale it! It might also harm plants.
Therefore, only use ‘food grade’ or ‘garden grade’ DE.
The costs of DE depend on the amount needed and on the manufacturer.
Normally, DE products are used in animal husbandry.
Diatomaceous Earth | Powder | 0.5 lb with applicator
Click the image to see the offer on Amazon.
Conclusion
ConclusionDiatomaceous earth is a suitable agent against mites and other vermin in animal husbandry.
It is not recommended in the fight against slugs and snails.
Not only is it expensive and impractical, but its efficacy in repelling slugs is also questionable.
The significant disadvantage is that diatomite is no longer effective when moist because in wet conditions slugs are particularly active.
Unfortunately, the insecticidal effect of DE can also kill valuable natural enemies of slugs and snails.
For example, it kills ground beetles, soldier beetles, fireflies, and other insects that help in the fight against slugs and snails.
In addition, it is unsuitable for large areas.
The price is high, and the application is labor-intensive, as protective walls made of DE must be renewed after rain.
Finally, there are health risks that make application more difficult and dangerous.
In a household with children or pets, the product is therefore not recommended.
There are safer, cheaper methods and ways to protect plants against slugs.
Slug & Snail Fence | Protective Barrier
Click the image to see the offer on Amazon
What Are Alternatives to DE?
There is a wide range of alternative methods.
To protect individual plants, special snail and slug collars are recommended.
They are weatherproof and harmless to animal and human health.
For larger beds, slug fences are an effective alternative. They are safe and provide long-term protection.
 |  |
Planters and pots can be protected, for example, by protective stripes of slug-repelling copper tape.
It is also possible to use the slug-repelling paint, Schnexagon.
 |  |
In addition, it is possible to cultivate slug-resistant vegetables and herbs.
There is also a long list of flowers that slugs do not like to eat.
Electric protection against snails & slugs
Click the image to see the offer on Amazon.
 |  |
Long-term slug control focuses on attracting natural enemies of slugs and snails.
Here, you will find an overview of measures to control slugs and snails.
 |  |
Peaceful Slug Control & Plant Protection
|  |
| Snail & Slug Repellent Copper Tape | Adhesive | Anti-Slug Fence | Protective Barrier |
| View on Amazon | View on Amazon |
| or on eBay |
 |  |
| Sheep Wool Pellets | Natural Snail Repellent | Anti-Slug Collars | For Single Plants | Multipack |
| View on Amazon | View on Amazon |
| or on eBay | or on eBay |
Alternative WaysYou just read about “Diatomaceous Earth for Slugs and Snails”. Not every method suits every garden, so here are gentle alternatives and an overview of what works.
Overview of methods
Attract More Beneficial Wildlife to Your Garden
Turn your garden into an ark for biodiversity. Swipe or scroll sideways →
Promote Biodiversity & Strengthen Natural Balance
Slug-resistant plants
Recommendations | Natural Protection
More Recommendations | Gentle Slug Protection
Mindful consumption: Please only buy what you or your garden really need.
Did you find what you were looking for?
If that is not the case, kindly leave a message or a comment. By doing this, you will help improve the website.
- Garden Snails & Slug Control | 23+ Measures & Methods - February 1, 2023
- Snails & slugs on the balcony: Where do they come from? What to do? - January 27, 2023
- Does Garlic Help Against Snails & Slugs? | Field Test - January 26, 2023
From this article on diatomaceous earth against slugs and snails I am so thankful. I was going to use DE on my lettuce tonight but do not want to injure the good insects. I especially appreciate being challenged to learn about the copper connection with slugs. This I did not know, I am going to try the copper tape from Amazon and try my luck. I did read it works, but I like to prove things. Thank you Slug Help for the assistance.