How to Use Neem Oil on a Plant as a Soil Drench?

Neem oil is a natural, effective pesticide that has been used for centuries to control pests and diseases in plants. It is extracted from the seeds of the neem tree, native to India and other parts of Southeast Asia. In this article, we will explore how to use neem oil on a plant as a soil drench, including its benefits and best practices for application.

Neem Oil Insecticide

Neem oil insecticide is an organic and natural product that can control pests in gardens, crops, and households. Neem oil is extracted from the neem tree’s seeds, native to India and Southeast Asia. It has been used for centuries as a natural remedy for several ailments, such as skin problems, fever, and stomach disorders.

Neem oil contains several active ingredients that make it effective against pests. The most important one is azadirachtin, which affects the growth and development of insects by disrupting their hormonal balance. Neem oil also acts as a repellent by making plants taste harmful to insects or by masking their scent. This makes it an effective alternative to synthetic pesticides that can harm beneficial insects like bees or butterflies.

Using neem oil insecticide is easy and safe if you follow some basic guidelines.

How to Use Neem Oil on a Plant as a Soil Drench?

How to Use Neem Oil on a Plant as a Soil Drench?

To apply neem oil on plants, dilute it with water per instructions and spray it over the entire plant, including leaves, stems, flowers, and fruits. It is advisable to apply it during the early morning or late afternoon when the temperature is cool to prevent any damage to the plant due to excessive heat. Neem oil can be applied weekly or bi-weekly until the pests are under control.

Mix one tablespoon of concentrated neem oil with one gallon of water in a watering can or sprayer to apply neem oil. Pour the solution into the ground around your plant and allow it to absorb completely. The neem oil will work into the soil, killing any harmful fungi or bacteria that may cause root rot. 

Root rot is a common fungal disease that affects many plants, causing their roots to rot and die. This can be fatal to your plant if left untreated. Applying neem oil as a soil drench is a natural solution to prevent root rot.

Tips to Apply Neem Oil Spray on the Plants

Here are some steps to apply neem oil spray on your plants.

  • Before applying neem oil spray, it is essential to read the label carefully and follow all instructions.
  • Make sure you are using pure neem oil without any additives or chemicals.
  • It is recommended to apply neem oil spray early in the morning or late in the evening when temperatures are cooler and there’s no direct sunlight, as it can cause damage to leaves.
  • Shake the bottle vigorously before use to ensure proper mixing of contents.
  • Make sure that the plant foliage is dry before spraying. Wet foliage can cause the neem oil solution to run off the leaves, reducing efficacy.
  • Prepare the neem oil spray by mixing it with water according to the instructions on the package.
  • It’s important not to use too much oil or too little water, as this can burn your plant leaves and reduce their ability to photosynthesize properly.
  • Once you have prepared the solution, pour it into a sprayer and spray on all sides of each leaf until fully covered.
  • It would be best to consider areas where pests might hide, such as under leaves or along stems.

Neem Oil Insecticide As Soil Drench

How to Use Neem Oil on a Plant as a Soil Drench?

Neem oil contains Azadirachtin, which is efficient against soil-dwelling pests such as fungus gnats, root aphids, and other harmful insects. This powerful compound disrupts the pest’s hormonal balance, causing them to stop feeding and eventually die.

Dilute it properly to avoid harming beneficial microbes in the soil. You can mix one tablespoon of neem oil with one gallon of water and apply it directly to the roots of your plants. Alternatively, you can use pre-made neem oil products specifically formulated for soil drenching.

When used as a soil drench, neem oil disrupts the life cycle of insects that feed on plant roots. The active ingredients in neem oil repel and kill insects like aphids, whiteflies, mealybugs, and soil mites that cause damage to plants. Using it as a soil drench, the roots absorb the neem oil and distribute it throughout the plant’s system. As a result, pests get eliminated from every part of the plant, including leaves and stems.

How to Make A Neem Oil Soil Drench?


To make a neem oil soil drench, you will need some basic ingredients: 

  • One tablespoon of pure neem oil (not the one mixed with other chemicals),
  • One quart water 
  •  Liquid soap or emulsifier.


To make a neem oil soil drench, you’ll need essential equipment such as a bucket or watering can, measuring cups, neem oil, water, and dish soap. The first step is to mix one teaspoon of pure neem oil with one teaspoon of dish soap in a small bowl. This helps emulsify the mixture so it can be easily mixed with water. Next, fill your bucket or watering can with about one gallon of lukewarm water.

Remember to mix up what you will use in one go to avoid waste or contamination. Use one tablespoon of neem oil per gallon of water for best results.

Neem Oil Insecticide As Soil Drench – Precautions:

It’s important to note that neem oil should be used with caution. Like any other substance, it can cause harm if not handled properly.

Do a Patch Test

Conducting a patch test before using neem oil as a soil drench on your plants is crucial. This simple process involves applying a small amount of neem oil to your plant’s single leaf or stem and observing how it reacts after 24 hours. You can use neem oil in larger quantities without adverse effects, such as wilting or discoloration.

Avoid Neem Oil Spray on Carnivorous Plants 

here are some precautions you need to take if you’re using it on carnivorous plants. These unique specimens cannot tolerate soap or any surfactant that might be present in some commercial neem oil products.

Carnivorous plants have specialized leaves that trap and digest insects as their primary source of nutrients.

Avoid Neem Oil Spray on Cannabis

Avoid spraying neem oil directly onto cannabis leaves or flowers. This can lead to mold development and damage the plant’s health. Instead, mix neem oil with water and apply it directly to the soil around the base of the plant.

Use neem oil sparingly and only as needed. Overusing any pesticide can lead to pest resistance and harm beneficial insects. Using neem oil once every two weeks or less frequently, if possible, is recommended.


Using neem oil as a soil drench can effectively combat pest and fungal infestations in your plants. It is important to dilute and apply oil consistently for the best results. Neem oil also has additional benefits, such as promoting root growth and deterring insects from laying eggs in the soil. By following these simple steps, you can ensure healthier and stronger plants without harmful chemicals. Give it a try on your next gardening project and see the difference for yourself.

How often to apply neem oil to the soil?

You should apply it after 7 to 15 days. To prevent plants from pests.

Maria Khan