Garlic is one of the most popular ingredients in kitchens around the world. Its strong aroma adds wonderful flavor to everyday meals, but garlic has another interesting use that many gardeners appreciate.
For generations, gardeners have experimented with garlic-based preparations as natural ways to discourage certain unwanted insects from visiting their plants.
The secret lies in garlic’s naturally occurring sulfur-containing compounds, which give it its distinctive smell and flavor.
Instead of immediately reaching for commercial insect sprays, you can try preparing a simple homemade garlic solution for certain garden pests.
Although garlic spray is not a universal pesticide and cannot eliminate every insect or animal, it can be a useful addition to an integrated garden pest-management routine.
Why Do Gardeners Use Garlic?
Garlic contains several naturally occurring compounds, including allicin, which forms when fresh garlic is crushed or chopped.
These compounds contribute to garlic’s strong smell.
Some gardeners use this characteristic aroma to discourage soft-bodied insects and other small pests from settling on their plants.
Potential uses include:
- Helping discourage aphids.
- Making certain plants less attractive to some insects.
- Providing an alternative to some conventional garden sprays.
- Supporting an integrated approach to garden pest management.
However, results vary depending on the pest, concentration, weather, and plant species.
Garlic spray does not reliably repel mosquitoes, flies, rodents, snakes, lizards, frogs, or all other garden animals.
Homemade Garlic Garden Spray
This simple preparation requires only a few inexpensive ingredients.
Ingredients
- 5–6 fresh garlic cloves.
- 500 ml clean water.
- 1 teaspoon mild, unscented liquid soap (optional).
- A clean spray bottle.
- A fine strainer.
Avoid using strong household detergents or concentrated cleaning products.
Step 1: Peel the Garlic
Remove the outer skins from five or six fresh garlic cloves.
Discard any damaged or moldy pieces.
Step 2: Crush the Cloves
Place the garlic cloves on a clean cutting board.
Crush or finely chop them to release their natural aromatic compounds.
Step 3: Add Water
Transfer the crushed garlic into a clean container.
Add 500 ml of water and stir thoroughly.
Step 4: Allow the Mixture to Infuse
Cover the container and allow the garlic to soak for approximately 8–12 hours in the refrigerator.
This gives the water time to absorb some of the garlic’s aromatic compounds.
Step 5: Strain the Liquid
Pour the preparation through a fine strainer or clean cheesecloth.
Remove all garlic pieces to prevent the spray nozzle from becoming blocked.
Step 6: Prepare the Spray Bottle
Transfer the strained liquid into a clean spray bottle.
If desired, add a very small amount of mild, unscented liquid soap as a wetting agent.
Mix gently.
Step 7: Test Before Applying
Before spraying an entire plant, apply a small amount to one or two leaves.
Wait 24–48 hours and check for yellowing, spotting, or other signs of damage.
Some plants are sensitive to garlic preparations.
Step 8: Apply Carefully
If the test causes no damage, lightly spray a small area of the affected plant.
Avoid spraying flowers, beneficial insects, and plants exposed to intense sunlight or heat.
Repeat only when necessary and after checking the plant’s response.
Which Garden Pests Might Garlic Spray Discourage?
See more on the next page