Diatomaceous earth Diatomaceous earth has established itself as one of the most versatile and effective natural ingredients in gardening and organic farming. Its popularity is due to its ability to act as a fertilizer, biocide, and even provide micronutrients and protection against adverse environmental conditions, while always ensuring safety for plants, animals, and people. Below, we explore in depth all the applications, advantages, recommendations, and precautions for using diatomaceous earth for gardening.
What is diatomaceous earth and how is it obtained?
La diatomaceous earth It is a white or slightly grayish powder formed mainly by the fossilized remains of diatoms, microscopic single-celled algae that lived in seas and lakes millions of years ago. These algae have a siliceous exoskeleton called a frustule., whose high silica content forms the basis of this mineralized mineral after its sedimentation.
After the extraction of diatomite deposits, grinds and sifts until a powder with abrasive, absorbent, and porous properties is obtained. This powder is marketed primarily in two forms: natural (not calcined), used in agriculture and gardening, and calcined for industrial uses. Only the natural or food grade It is suitable for use with plants, animals or domestic applications.
Main characteristics and properties of diatomaceous earth
Among the most relevant properties of diatomaceous earth, they stand out:
- Physical insecticidal and biocidal action: Its main power lies not in any chemical principle, but in the ability of silica microcrystals to penetrate and damage the exoskeleton of insects, causing their desiccation and death.
- Low risk of resistance: Because they act physically rather than chemically, insects do not develop resistance as occurs with many synthetic pesticides.
- High absorbent capacity: It is capable of absorbing water, oils, and other substances, making it useful in a variety of applications, from gardening to the food industry.
- Silicon bioavailability: Your contribution of silicon can improve plant resistance to diseases and adverse conditions.
- Non-toxic product for people, animals and crops, provided that the uncalcined variety is used and minimum precautions are taken during its application.
Products formulated with diatomaceous earth are approved for both indoor and outdoor cultivation, and are especially valued in organic farming and pesticide-free production systems.
Types of diatomaceous earth: natural vs. calcined
La natural diatomaceous earth (or uncalcined) contains primarily amorphous silica, with a low percentage of crystalline silica, and is the only type recommended for agricultural, domestic, and animal use. It can be presented in ground or micronized form, adapting to different application methods (direct sprinkling or dissolving in water for spraying).
On the contrary, the calcined diatomaceous earth It is subjected to high temperatures to increase its crystalline silica content, which makes it toxic to mammals and restricts its use to industry (liquid filtration, thermal insulation, etc.).
When purchasing diatomaceous earth for the garden or orchard, Make sure it is food grade and not charred., generally indicated on the packaging.
How does diatomaceous earth act as a natural biocide?
The biocidal effect of diatomaceous earth is exclusively physicalSilica microcrystals act like thousands of microscopic blades that damage the protective cuticle of insects and other arthropods, facilitating water loss and causing dehydration. It does not poison, does not produce contact toxicity and does not leave chemical residues.
For this reason, it is effective against numerous pests, such as aphids, caterpillars, red spiders, thrips, whiteflies, ants, mealybugs, nematodes, snails, slugs, and others. It can be used:
- In direct sprinkle on leaves, stems and the substrate, forming a protective barrier.
- Dissolved in water and applied by foliar spraying, covering the surface of the plant well.
La action of diatomaceous earth It is immediate on insects that come into contact and also acts preventively, since its powder persists on the surface of plants and soil.
Advantages of using diatomaceous earth in gardening
- Ecological and biodegradable product, respectful of the environment: It does not generate hazardous waste or contaminate water or soil.
- Compatible with organic crops and ecological agriculture.
- It does not generate resistance nor affect crop rotation.: Since it is not a chemical pesticide, there is no risk of accumulation of harmful compounds.
- Safe for people and animals (provided the appropriate variety is used and with caution in application).
- Provides essential micronutrients such as silicon, nitrogen, phosphorus and potassium, contributing to soil fertility.
- easy to apply and without the need for shortages for the harvest.
- Broad and persistent action against various insects, both in outdoor crops and indoor ornamental plants.
Applications of diatomaceous earth in gardening and orchards
1. Pest control in ornamental and horticultural plants
Diatomaceous earth is one of the most effective and versatile natural controls for common pests. in the garden and orchard. Its effectiveness includes:
- Aphid
- Red spider
- Trips
- Cochineal
- White fly
- Caterpillars and larvae
- Snails and slugs
- Ants
- Nematodes
- Grain beetles
Its use is recommended for both preventive treatments (before pests appear) and to stop active infestations. It is used in:
- Garden plants (rose, hydrangea, hibiscus, etc.)
- Fruit trees and ornamental trees
- Vegetables and garden plants
- Indoor and outdoor plants
2. Fertilizer and soil improvement
Thanks to its silicon and micronutrient contentDiatomaceous earth stimulates plant growth, strengthens plant tissues, and improves their resistance to disease and water or heat stress. Applied as a mixture with the substrate or sprinkled on the soil, acts as a soil regenerator and conditioner, improving structure and water retention.
- Increases soil permeability and aeration.
- Reduces lodging in cereals and grasses.
- It reduces the incidence of pathogenic fungi by strengthening the cell walls of plants.
- Facilitates the absorption of essential nutrients.
3. Grain protection and seed conservation
A traditional use of the diatomaceous earth is biological protection of seeds and grain stored, preventing the proliferation of insects such as wheat or corn weevils. It is sprinkled on the storage boxes or sacks, acting as a barrier and prolonging the quality of the grain without using toxic products.
4. Improving plant resistance to environmental stress
El silicon contributed helps plants better withstand drought, high temperatures, and intense sunlight exposure. In addition, the layer of dust on the leaves can reflect some of the solar radiation, providing a natural protection from the sun and reducing evaporation during critical periods.
5. Pest control for pets and domestic animals
La diatomaceous earth Food grade is also used to eliminate fleas, ticks and other external parasites in dogs, cats, chickens and other domestic animals, rubbing the powder gently into the coatIt is harmless to animals, although it is always advisable to consult a veterinarian before applying it.
Application methods and recommended doses
Application by dusting
Sprinkle directly onto leaves, stems or substrate: This is the classic method for combating soft-bodied insect pests. It uses a container with a powder magazine to facilitate even dispersion of the powder.
- Apply a thin layer to the surface of the plant or substrate, covering the affected areas well.
- Avoid applying on rainy or windy days to ensure its effectiveness.
- Repeat every two or three weeks or after watering or heavy rain.
Spray application (in aqueous solution)
Mix the micronized diatomaceous earth in water (10-20 g/L) and shake well to prevent settling. Spray evenly over the entire surface of the plant, preferably during the coolest hours of the day and during flowering periods to avoid harming pollinators.
- Price quotation: 10 g per liter of water each month.
- Dressing: 20 g per liter of water every 15 days.
- In grain storage: 2 kg per ton of seeds.
- As a fertilizer in the substrate: 40-50 g per square meter or in the soil mix before transplanting.
In all applications, It is important to shake the product frequently so that the suspension is homogeneous.
Precautions and advice during application
Although the diatomaceous earth It is a safe and non-toxic product, It should be applied following some basic guidelines:
- Always wear gloves, a mask, and protective glasses. to avoid inhalation of dust, which can irritate the respiratory tract and eyes.
- Avoid direct application during flowering season and pollination, especially on flowers, so as not to harm bees and other beneficial insects.
- Do not apply on rainy days, since the effect disappears with water, nor in hours of strong wind.
- Indoors, ventilate rooms well after application. and avoid the presence of pets or children during treatment.
- Apply sparingly and only in affected areas to minimize the impact on auxiliary fauna.
Frequently Asked Questions About Diatomaceous Earth in Gardening
Is diatomaceous earth safe for pets and people?
Yes, as long as you use food-grade fertilizer and follow the recommendations. It's safe for people, pets, and crops.
What pests does diatomaceous earth eliminate?
Eliminates virtually any soft-bodied insect or mite, from aphids, whiteflies, thrips, spider mites, and mealybugs to snails, slugs, and ants. It also controls soil-borne insects and nematodes.
Can it affect beneficial insects?
Yes, by acting physically, it does not discriminate between harmful insects and pollinators. Therefore, Direct application to flowers or during the pollination period should be avoided..
What to do if the plant turns white after application?
After application, plants may be left with a whitish coating, which is completely normal and will disappear with watering or rain.
Does diatomaceous earth have an expiration date?
No, its properties remain stable indefinitely if stored in a dry, closed place.
Tips to get the most out of diatomaceous earth
- Use the lowest effective dose and repeat only if necessary so as not to affect the auxiliary fauna.
- Apply during the cool hours of the day, avoiding intense sun exposure. to prevent damage to young plant tissues and enhance dust adhesion.
- Mix diatomaceous earth with the substrate in transplants or sowing to strengthen protection from the start.
- In outdoor crops, sprinkle after watering for greater hold and persistence.
- Store the product in a dry and closed place to maintain its properties unchanged.
Diatomaceous earth is, today, an essential resource for any gardening enthusiast seeking effective, natural, and environmentally friendly solutions. Thanks to its versatility, physical action, and multiple benefits, it helps keep crops and ornamental plants free of pests and diseases, while also boosting their vigor and productivity. The key is to use it correctly, always choosing the right type, adjusting the dosage, and respecting sensitive pollination periods to ensure gardens and orchards that are always healthy, lush, and sustainable.
