Kaolin Clay: Tips On Using Kaolin Clay For Organic Garden Insect Control

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Kaolin clay (aka china clay) is an incredibly useful and versatile soft, white clay. It is used in the manufacture of porcelain and fine china.

The term “kaolin” originates from the Chinese word Kau-ling, meaning (“high ridge,”) designated for a hill in China where Jesuit missionaries first obtained the earliest pure clay samples about 1700 AD.

kaolin clay helps protect fruit from sun damage and works as organic control against pests Pin

It is also essential for manufacturing paint, paper, rubber, and other products’ scores.

Additionally, it has many uses in health and personal care applications and is an excellent addition to your garden insect control arsenal.

In this article, we share information on using kaolin in the garden. Read on to learn more.

Pure Kaolin Clay Provides Natural Pest Control

There are some kaolin products (Surrounding mineral kaolinite clay) prepared for garden use that are mixed with pesticides and other undesirable ingredients.

This is not necessary for good control using this all-natural mineral, chemically inert clay.

The application of pure kaolin to dust crops of all sorts has been shown to be an effective way to reduce negative environmental impacts, prevent disease and deter many different kinds of insect pests.

It only takes a very light amount of the powder to attain excellent results.

The application is easy because the very finely ground clay powder mixes smoothly and can be applied as a light foliar spray.

This thin layer of clay powder works to baffle insect pests in that it blocks the scent of the desired plant and (apparently) alters its taste of it as well.

It is the mildest of all clays and is suitable for people with sensitive skin. It helps stimulate circulation to the skin while gently exfoliating and cleansing it.

What Kinds Of Pests Does Kaolin Control?

Although this treatment is not effective on all plants against all with pest problems, it is a fairly broad spectrum.

It works especially well on Brussels sprouts, zucchini, eggplant, squash, and cucumbers to defend against:

  • Colorado potato beetles
  • Cucumber beetles
  • Squash bugs
  • Flea beetles (the tiny black bugs on plants)
  • Apple Maggot
  • Japanese Beetles
  • Codling Moths

…and similar pests.

Organic Control Of Cucumber Beetle Pests

For more on cucumber beetle control, see our article: How To Control Cucumber Beetles

Studies conducted by the United States Department of Agriculture (USDA) have shown that kaolin is also very effective in preventing thrips infestation on small fruit trees.

Specifically, an application of the powder applied at 50% bloom deters thrips and provides a number of other horticultural benefits.

The use of kaolin clay at this point in fruit development helps more fruit (such as apple trees and pear trees) to set but does not negatively affect the quality of the fruit.

Furthermore, the application of the clay encourages good growth and does not interfere with the activities of beneficial pollinators.

How To Use Kaolin Clay

The clay powder should be mixed with water at a rate of three cups of powder per gallon of water.

Some gardeners like to add a few drops of natural liquid soap to act as a surfactant.

If you are treating mature plants, you can add a little fish emulsion for plants to provide foliar feeding.

It’s best to put the dry clay into a dry bucket and then gradually stir the water in.

If you dump the water in all at once or try to add the clay to the water (rather than the other way around), you may have trouble with clay sticking to the bucket or lumping up rather than dissolving.

Use an old baking whisk to stir, as this helps prevent lumps.

Even though kaolin clay is an all-natural, harmless product, you should use a dust mask and goggles to protect your eyes, mouth, and nose when you handle and mix it.

The powder is non-toxic and will not seriously harm you, but inhaling it and/or getting it in your eyes would be unpleasant.

How To Apply Kaolin Clay?

As with all foliar sprays, it’s best to apply it on a still day when the sun is not too harsh.

Applying foliar sprays on a windy day results in over-spray and waste of product.

Any time liquid pools on the leaves of a plant, harsh sunlight can become magnified and cause burned spots.

For this reason, it’s best to apply the spray on an overcast morning; however, you should check the weather forecast first.

If it’s about to rain, don’t apply the spray, as it will just be wasted.

Once you’ve mixed up your solution, use a backpack sprayer for application over large areas, or use a small spray bottle to apply it to just a few plants.

For best results, a sprayer with continuous agitation is recommended.

Alternatively, you can use the dunk method demonstrated in the video above.

Regardless of how you apply the solution, you must be sure to coat every bit of the plants’ surfaces.

If you leave any part of the plant exposed, pests are sure to find it.

Every leaf and stem must be coated with a light layer of white clay as a crop protectant.

This will leave your plants looking dusty, but this can be a benefit.

The light dusting of clay particles not only protects your plants against pests but also provides some protection from very harsh sunlight.

How Often Should You Apply The Clay?

Generally speaking, you should plan to apply your solution a minimum of twice a month unless you plan on spending all day handpicking pests.

Remember that you must be vigilant because any leaf exposure opens a window for pests to get in.

You must take care not to wash the mixture off.

Don’t use a sprinkler!

It’s always smarter to water close to the ground because this method results in less waste and helps prevent problems with fungal infections.

How Does The Clay Deflect Pests?

When pests encounter a plant covered with kaolin clay, they are simply confused. They don’t recognize it as being edible.

This is excellent if you are introducing new plants into an area where pests have been spotted.

Even with an established pest population, you can use the clay to battle the pests and continue adding new plants with some measure of confidence.

Is It Good To Use Kaolin On Tomatoes?

A study conducted in 1985 found that the application of kaolin clay to tomato plants grown in very hot, dry conditions in the south-central US improves yield by providing protection from heat stress.

The same study concluded that spraying tomato plants in a non-irrigated field only once with a 5% percent kaolin and distilled water solution helped the plants to improve yield.

Research conducted in Oklahoma in 2005 and 2006 and published by the American Society for Horticultural Science attempted to replicate the 1985 study.

Researchers wanted to determine how and when kaolin (i.e., the product known as Surround WP, of which 95% of the active ingredient is Kaolin clay) should be applied to tomatoes being grown for market.

surround WP labelPin

The researchers especially focused on the sun-shielding qualities of the product and also wanted to know if Surround WP could prevent the development of beet curly top virus (BCTV) in tomato plants.

BCTV is spread by leafhoppers and has wrought havoc with Oklahoma tomato crops in the past.

Kaolin clay has been used successfully to prevent leafhopper attacks on chile pepper plants in New Mexico.

It stands to reason that it might be an effective insect control against these pests on tomato plants.

The product was mixed with water at a rate of half a pound per gallon of water and applied using a pressurized hand sprayer.

The spraying commenced as soon as the young plants were transplanted to their permanent settings with repeated applications on a regular basis as needed to keep a consistent powdery barrier film on all foliage surfaces.

Spraying was stopped when the plants produced green fruits measuring five centimeters in diameter or before the first harvest of ripened fruit. The fruit was harvested as needed as it matured.

The 2005 researchers found that the use of kaolin clay actually reduced the amount of fruit produced and the weight of that fruit.

In 2006, they found the kaolin clay had no significant effect on the weight and number of fruit when comparing the output of the kaolin-treated plants with the untreated plants in the control group.

Based on these results, the researchers concluded that applying Surround WP, which is OMRI certified before the start of harvest, does not positively affect yield.

Additionally, they found that a coating of kaolin dust can make it difficult to tell whether the fruit is ready to harvest.

Furthermore, it can be difficult to wash the clay coating off the fruit before sending it to market.

In the course of the study, one plant was found to be affected by BCTV in 2005, and none were affected by this malady in 2006.

It is unclear whether the application of kaolin played a role in this result.

Applying Kaolin Surround WP Clay Powder to Crop of Tomatoes

Should You Use Kaolin Clay In Your Backyard Vegetable Garden?

Although the use of this natural mineral on tomatoes bound for the market is somewhat uncertain, the bottom line is, you have nothing to lose by giving this time-tested product a try.

The use of kaolin and other types of minerals (e.g., diatomaceous earth) has been a common practice for over 2000 years.

We answer the question: Are Diatomaceous Earth And Bentonite Clay the Same?

Ancient Egyptian and Chinese farmers made great use of minerals to dust crops, and many kinds of animals instinctively knew that taking a dust bath was a good way to repel pests.

This naturally occurring mineral has proven itself generally beneficial for all manner of uses.

Christopher Vincent, a researcher at the University of Florida Institute of Food and Agricultural Sciences, shares that “kaolin clay outperforms foliar insecticides” for managing to spread psyllids.

Products prepared especially for use in the vegetable are effective against:

  • A wide range of insect pests
  • Provide a layer of protection against harsh sun
  • It may even reduce plants’ susceptibility to fungal diseases.

One of the best benefits of choosing to use kaolin clay and other natural alternatives is that your:

  • Smart choice protects you
  • Protects your soil
  • Protects the air and water in your immediate environment against chemical pesticide pollution

An added bonus is that you can always tell when it’s time to apply more spray.

When the fine white film:

  • Begins to wear off
  • Gets washed off by a heavy rain
  • Or when new leaves grow

… it’s time to reapply!

Where Can You Get Kaolin Clay?

You can pick up this handy product at almost any farm supply store or yard and garden center. Depending on your skin needs, include kaolin clay in your skin care regimen to see the results. 

7 Benefits of Kaolin Clay & How to Use it For Skin

Absorbs Extra Oil

Kaolin clay absorbs extra oil from your skin’s surface, thereby keeping your pores unclogged. It only controls the excess sebum production on your skin surface and does not affect its natural oil level.

Natural Cleanser

Kaolin clay has cleansing properties that can remove dirt and impurities [3] from your skin pores that lead to acne breakouts. It is gentle to use on your skin and cleans your skin without making it dry and dull.


Kaolin clay is an excellent exfoliator. It can remove even the tiniest quantities of dirt, pollutants, and bacteria from your skin, keeping your acne problems at bay.

Soothes Your Skin

Kaolin clay has soothing qualities that can calm your irritated skin caused by insect bites or any skin rash. It has mild healing properties that help to soothe any type of irritation and redness on your skin.

Evens Out Your Skin Tone

This clay stimulates your skin cells and makes your skin tone even. If you use it regularly, you may see a noticeable change in your skin tone.

Natural Shampoo

Apart from skincare, you can also use kaolin clay as a natural shampoo to remove oil, dirt, and other pollutants from your scalp. It also boosts blood circulation to your scalp, resulting in strong hair follicles.

Teeth Whitener

The ability of Kaolin clay to draw out impurities makes it an excellent substitute for whitening toothpaste. It can remove the toxins and gunk from your teeth and make them whiter.

How To Use Kaolin Clay For Skin?

Kaolin Clay as a Cleanser:

If you want to use kaolin clay as a cleanser, you can opt for kaolin clay-based OTC products. You can also use its powdered form for your regular cleaning procedure.

How to use

1. Take some warm water into your palm.

2. Mix a pinch of kaolin clay with the water.

3. Rub it on your face gently.

4. Wash it off and pat your face dry

Kaolin Clay as a Mask:

Kaolin clay masks are also available over the counter. But there are a few things you need to keep in mind while applying a mask.

1. Clean your face properly before applying the mask.

2. Keep the brush(applicator) clean before and after applying the mask. This will ensure that no pathogen enters your skin.

3. Apply the mask on your face and neck to get even-toned skin on both.

4. A Kaolin clay mask has to stay on your face for at least 9 minutes.

5. Moisturize your skin after you wash off the mask.

DIY Masks With Kaolin Clay

1. Kaolin Clay & Green tea:

Mix 2 tablespoons of kaolin clay with 2 tablespoons of cooled green tea and aloe vera extract. Add 2 drops of lavender essential oil. Make a paste and apply it as a mask.

2. Kaolin Clay & Avocado Face Mask:

Take 2 tablespoons of kaolin clay and mix it with 3 tablespoons of mashed avocado and rose water. Apply the mixture on the face and leave it for 10 minutes.

3. Kaolin Clay & Honey Mask:

Add 2 tablespoons of kaolin clay with 2 spoons of honey and rose water. Your kaolin-honey face mask will be ready. Use it all over your face with a brush and wash it off once it dries. 

4. Kaolin & Apple Cider Vinegar:

Take 1 tablespoon of kaolin clay and mix it with 2 tablespoons of apple cider vinegar. Add your choice of essential oils and combine such ingredients. Apply it on your face and let it dry. Wash with lukewarm water to clean. 

However, ensure that you avoid harmful ingredients and go for natural ingredients such as kaolin clay, which suits all skin types.

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