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Writer's pictureAndy Hemmer

Companion Planting and Diatomaceous Earth

Updated: 4 days ago


companion planting with marigolds

Organic gardening is a fulfilling hobby that connects us with nature, but pesky crawling insects like spider mites, can turn this relaxing pursuit into a frustrating battle. Chemical pesticides might offer a quick fix, but they come with environmental and health risks. Fortunately, nature provides us with effective, sustainable alternatives—companion planting and diatomaceous earth (DE). This post will explore how these natural solutions can help you manage insects in your garden while supporting biodiversity.



 


Using Plants to Repel or Attract Insects

companion planting

Plants are powerful allies in the garden and one of the most eco-friendly pest control methods. Some naturally repel pests, while others act as "trap crops," drawing insects away from your prized plants. Here are some examples and how to use them:


1. Companion Planting for Pest Control

Companion planting involves strategically placing certain plants together to create a natural defense system. For example:


  • Marigolds: These vibrant flowers repel aphids, mosquitoes, and nematodes with their strong scent. Plant them near tomatoes, beans, or squash.


  • Basil: Known for repelling flies, mosquitoes, and whiteflies, basil also improves the flavor of nearby tomatoes.


  • Lavender: This fragrant herb deters moths, fleas, and beetles while attracting pollinators like bees.


2. Trap Crops

Some plants lure pests away from your main crops:


  • Nasturtiums: A favorite of aphids and caterpillars, nasturtiums can be planted around vegetable beds to keep pests off your food plants.


  • Radishes: These can attract root maggots, sparing other root vegetables.


3. Plants That Attract Beneficial Insects

Not all insects are bad. Many are natural predators to pests. To support these "garden helpers," grow plants like:


  • Yarrow and Dill: These attract ladybugs and lacewings, which feed on aphids.


  • Milkweed: A magnet for monarch butterflies and bees.



 


What Is Diatomaceous Earth (DE)?

diatomaceous earth

Diatomaceous earth is a natural powder made from the fossilized remains of tiny aquatic organisms called diatoms. These organisms have a silica-based exoskeleton, and their fossilized remains are ground into a fine, abrasive powder. We are referring to food grade diatomaceous earth which is a white powder and not the type of diatomaceous earth used in pool filters.


How DE Works on Insects


DE isn't a chemical pesticide; it's a mechanical one. Diatomaceous earth works by having sharp edges of the tiny silica particles that cut through an insect’s exoskeleton, causing them to dehydrate and die. It's effective against:


  • Ants

  • Fleas

  • Slugs

  • Earwigs

  • Beetles



Using DE in the Garden


Application Tips


  • Dry application is Key: DE works best when dry. Apply de after rain or watering.


  • Target Problem Areas: Sprinkle DE around the base of plants, on the soil, or directly on insects.


  • Use a Duster Tool: This helps evenly distribute DE on leaves and stems without overapplying.


Safety Precautions


  • Wear a mask to avoid inhaling DE, as the fine particles can irritate the lungs.


  • Use food-grade DE for gardens, as it’s safe for humans and pets. Avoid pool-grade DE, which is treated with chemicals.


Environmental Considerations

While DE is effective, it can harm beneficial insects like bees if overapplied. Use it judiciously and avoid areas where pollinators frequent, such as flowers in bloom.




Earthworks Health Diatomaceous Earth 10lb bag


 


Companion Planting and Diatomaceous Earth to Control Insects in Your Garden


Companion planting and Diatomaceous earth to control insects in your garden creates a multi-layered defense against pests:


  • Create Borders with Repellent Plants: Surround your garden beds with marigolds or lavender.


  • Sprinkle DE Strategically: Focus on problem zones or plants prone to infestations.


  • Support Beneficial Insects: Grow plants that attract predators to naturally manage pest populations.


For example, you could plant nasturtiums to attract aphids away from your vegetables while sprinkling DE around the nasturtiums to deal with the pests. This approach minimizes harm to pollinators while protecting your crops.



 


Conclusion


Using plants and diatomaceous earth for pest control is not only effective but also eco-friendly. These natural methods preserve the delicate balance of your garden's ecosystem, reducing the need for harmful chemicals. By incorporating companion plants, attracting beneficial insects, and strategically using DE, you can enjoy a thriving, pest-resistant garden.


Experiment with these methods and observe how your garden responds. Over time, you'll develop a personalized, sustainable approach to keeping pests at bay.


HAPPY GARDENING!!


Would you like suggestions for additional resources or related topics? Let us know!






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