Cinnamon Isn’t Just for the Kitchen: 10 Remarkable Uses for Cinnamon in Your Garden
That jar of cinnamon sitting in your spice rack isn’t just for baking cookies and sprinkling on toast. This common kitchen spice has surprising powers in the garden that can help you grow healthier plants while reducing the need for harsh chemicals. Cinnamon—derived from the inner bark of several tree species from the genus Cinnamomum—contains natural compounds that can fight fungi, deter pests, and even promote root growth.
The best part? It’s affordable, readily available, and completely natural. Before you reach for chemical solutions to common garden problems, consider these ten remarkable ways to put cinnamon to work in your garden.
1. Prevent Damping Off Disease in Seedlings
One of the most frustrating experiences for gardeners is losing newly sprouted seedlings to damping off disease. This fungal problem causes seedlings to suddenly wilt and die just as they’re getting started. The culprit? Soil-borne fungi that thrive in the consistently moist conditions needed for seed germination.
Cinnamon’s powerful antifungal properties make it an effective preventative treatment for this common problem.
How to use it:
- Sprinkle a light dusting of ground cinnamon on the soil surface after sowing seeds
- Apply again after seedlings emerge, being careful not to cover the tiny plants
- For extra protection, mix a teaspoon of cinnamon into your seed-starting mix before planting
One study from the University of California found that cinnamon was effective against several species of Phytophthora, a genus of water mold that causes damping off. The natural compounds in cinnamon disrupt the fungal life cycle without harming your delicate seedlings.
2. Heal Plant Wounds and Cuts
Just as you might apply an antiseptic to a cut on your skin, plants benefit from protective treatment when they’re injured. Whether from pruning, accidental damage, or storm breakage, wounds on trees and shrubs can become entry points for disease.
Cinnamon’s antifungal and antibacterial properties help protect these vulnerable areas while the plant heals itself.
How to use it:
- Ensure the wounded area is dry
- Apply ground cinnamon directly to cuts, breaks, or pruned areas
- For larger wounds, make a paste with a small amount of water and apply it with a clean brush
- Reapply after heavy rain until the wound begins to heal
This treatment is especially useful for roses, fruit trees, and ornamental shrubs that are susceptible to fungal and bacterial infections. The cinnamon creates a protective barrier while the plant activates its natural healing mechanisms.
3. Root Growth Stimulator for Cuttings
Propagating plants from cuttings is a rewarding and economical way to expand your garden, but getting those cuttings to develop roots can sometimes be challenging. While commercial rooting hormones are effective, cinnamon offers a natural alternative that many gardeners find works surprisingly well.
How to use it:
- Take your cutting as usual from a healthy plant
- Allow the cut end to dry slightly for a few minutes
- Dip the cut end into ground cinnamon, covering about 1/4 inch
- Plant the cutting in your preferred rooting medium
The mild stimulating effect of cinnamon promotes callus formation—the first step in developing new roots. Additionally, its antifungal properties protect the vulnerable cutting from rot during the rooting process. This dual action makes cinnamon particularly effective for propagating woody herbs like rosemary, sage, and lavender.
4. Control Ants Naturally
Ants can be beneficial in some garden contexts, but they can also farm aphids, disturb plant roots, and become a nuisance in garden beds. Unlike chemical ant killers that can harm beneficial insects, cinnamon offers a gentler approach to managing ant populations.
How to use it:
- Sprinkle ground cinnamon in a line around beds you want to protect
- Create barriers around potted plants by dusting the rims
- Apply directly to ant hills and entry points to discourage colony formation
- Reapply after rain or heavy watering
Ants strongly dislike the potent compounds in cinnamon, particularly cinnamaldehyde. The spice doesn’t kill them but effectively disrupts their scent trails and discourages them from crossing established barriers. This makes cinnamon an excellent choice for deterring ants from vegetable gardens, berry patches, and outdoor seating areas.
5. Combat Fungal Diseases
Fungal problems like powdery mildew, leaf spot, and rust can devastate garden plants, particularly in humid conditions. While severe infections may require dedicated fungicides, cinnamon can help manage mild cases and prevent the spread of fungal spores.
How to use it:
- For powdery surfaces: Mix 1-2 tablespoons of ground cinnamon with a quart of warm water, let steep overnight, strain, and spray on affected plants
- For soil-borne fungi: Work a light dusting of cinnamon into the top inch of soil around affected plants
- For prevention: Apply the cinnamon spray as a preventative measure during humid periods
Research published in the Journal of Agricultural and Food Chemistry has shown that cinnamaldehyde, a major component of cinnamon, effectively inhibits the growth of various fungi. Regular application can help keep fungal problems in check while you address any underlying issues that might be promoting fungal growth, such as poor air circulation or overwatering.
6. Deter Mosquitoes and Other Insects
Creating a pleasant outdoor environment means managing insects that can make garden time uncomfortable. Mosquitoes, flies, and other flying pests are repelled by the strong aroma of cinnamon, making it a valuable tool for enhancing outdoor enjoyment.
How to use it:
- Sprinkle ground cinnamon around seating areas and pathways
- Make cinnamon bundles by wrapping cinnamon sticks in breathable fabric and hanging them in garden areas
- Create a spray by steeping cinnamon sticks in hot water, cooling, and transferring to a spray bottle
- Burn cinnamon incense or cinnamon-infused candles in outdoor spaces
The volatile oils in cinnamon mask the scents that attract biting insects and create an aromatic barrier that many pests prefer to avoid. While not as potent as DEET or other chemical repellents, cinnamon can significantly reduce insect activity in targeted areas, especially when used in combination with other natural strategies.
7. Keep Cats Out of Garden Beds
As much as we love our feline friends, their habit of using garden beds as litter boxes can be problematic. Cats can damage young plants and potentially introduce parasites into soil used for growing food. Fortunately, most cats dislike the strong scent of cinnamon.
How to use it:
- Sprinkle a generous layer of ground cinnamon on the soil surface of vulnerable beds
- Create a perimeter of cinnamon around newly planted areas
- Mix cinnamon with dried orange peels for a stronger deterrent effect
- Reapply after rain or irrigation
The sensitive olfactory system of cats finds the intense aroma of cinnamon overwhelming and unpleasant. Unlike mothballs or chemical deterrents, cinnamon is non-toxic to cats, making it a safe choice even for households with pets. The deterrent effect is strongest when the cinnamon is fresh, so regular application may be necessary.
8. Improve Soil Health
Healthy soil is the foundation of a thriving garden, and cinnamon can contribute to soil wellness in several ways. Its antifungal properties help maintain a balanced soil microbiome without the harsh effects of synthetic fungicides.
How to use it:
- Mix a small amount (1-2 teaspoons per square foot) into the top layer of soil
- Add a pinch to compost bins to help control fungal growth and reduce odors
- Include in potting mixes, especially for plants susceptible to root diseases
- Use in moderation, as too much can inhibit beneficial fungi
Cinnamon helps control harmful fungi while having minimal impact on beneficial soil organisms when used appropriately. It’s particularly valuable in container gardens and raised beds where soil-borne diseases can quickly spread through the limited growing medium. As an added benefit, cinnamon slowly decomposes, releasing nutrients that feed soil microorganisms.
9. Protect Bulbs During Storage and Planting
Flower bulbs represent a significant investment for gardeners, making their protection during dormancy and planting important. Fungal rot can destroy stored bulbs, while newly planted ones can fall victim to various soil pathogens and pests.
How to use it:
- Dust dried bulbs lightly with cinnamon before storing them
- Add a teaspoon of cinnamon to paper storage bags containing bulbs
- Sprinkle in planting holes before setting bulbs
- Mix with bone meal or other bulb fertilizers to provide dual benefits
This treatment is particularly effective for protecting expensive specialty bulbs like lilies, dahlias, and tulips. The cinnamon creates an inhospitable environment for fungi that cause bulb rot while deterring some soil-dwelling pests that might damage newly planted bulbs. Many experienced gardeners swear by this technique for improving bulb survival rates.
10. Create Chemical-Free Shelf Life Extension for Cut Flowers
Extending the vase life of cut flowers from your garden allows you to enjoy your blooms longer. Commercial flower preservatives work well but contain chemicals you might prefer to avoid. Cinnamon offers a natural alternative that can help keep cut flower water clear and fresh.
How to use it:
- Add 1/4 teaspoon of ground cinnamon to vase water
- For larger arrangements, use up to 1/2 teaspoon
- Combine with a teaspoon of sugar for nourishment and a few drops of lemon juice for pH balance
- Change the water and add fresh cinnamon every 2-3 days
The antimicrobial properties of cinnamon help prevent the bacterial growth that clouds vase water and blocks stem uptake. This keeps the water clearer longer and allows flowers to draw up moisture more efficiently. While not quite as effective as commercial preservatives, this natural alternative significantly extends bloom time compared to plain water.
How to Choose the Right Cinnamon for Garden Use
Not all cinnamon is created equal when it comes to garden applications. The two main types available commercially are:
Ceylon cinnamon (Cinnamomum verum) – Sometimes called “true cinnamon,” it has a milder, more complex flavor and contains lower levels of coumarin, a compound that can be harmful in large doses.
Cassia cinnamon (Cinnamomum cassia) – The more common variety found in supermarkets, with a stronger, spicier flavor and higher levels of cinnamaldehyde, the compound responsible for many of cinnamon’s antifungal properties.
For garden use, cassia cinnamon is generally preferable due to its higher cinnamaldehyde content and lower cost. Save your premium Ceylon cinnamon for culinary uses where its subtle flavor is appreciated.
When purchasing cinnamon for the garden:
- Buy in bulk to save money
- Look for fresh, fragrant powder with good color
- Store in an airtight container away from heat and light
- Consider dedicated containers for garden and kitchen use to avoid contamination
Safety Considerations When Using Cinnamon in the Garden
While cinnamon is natural and generally safe, a few precautions are worth noting:
- Respiratory sensitivity: Some people may experience respiratory irritation from cinnamon dust. Wear a mask when applying large amounts.
- Skin irritation: Cinnamon can cause skin irritation in sensitive individuals. Consider wearing gloves during application.
- Pet safety: While cinnamon is non-toxic to pets in small amounts, large quantities could cause digestive upset. Use with discretion if pets have access to treated areas.
- Beneficial fungi: Used in excess, cinnamon could potentially impact mycorrhizal fungi beneficial to plant roots. Apply judiciously.
Conclusion: Spice Up Your Gardening Routine
From seedling protection to pest deterrence, cinnamon offers a versatile, affordable, and natural solution to many common garden challenges. This humble spice deserves a permanent place not just in your kitchen cabinet but also in your gardening toolkit.
As gardeners increasingly seek environmentally friendly alternatives to synthetic chemicals, traditional remedies like cinnamon are experiencing renewed appreciation. By incorporating this aromatic spice into your gardening practices, you’re connecting with centuries of plant wisdom while embracing modern sustainable approaches.
The next time you face a garden challenge, consider reaching for the cinnamon before stronger chemicals. Your plants, beneficial insects, and the environment will thank you for this spicy solution that proves sometimes the best garden helpers come from the most unexpected places—like your spice rack.
Frequently Asked Questions About Cinnamon in the Garden
Q: Can I use cinnamon oil instead of powder in the garden? A: Cinnamon essential oil is much more concentrated than powder and can burn plants if not properly diluted. For most garden applications, the powder form is safer and easier to use. If you do use oil, dilute it significantly (15-20 drops per quart of water) and test on a small area first.
Q: How often should I reapply cinnamon? A: Cinnamon’s effectiveness diminishes over time, especially after rain or irrigation. For pest deterrence, reapply every 1-2 weeks and after heavy rain. For seedling protection, a single application is often sufficient until the plants develop true leaves.
Q: Will cinnamon harm beneficial insects like bees and butterflies? A: When used as directed, cinnamon generally doesn’t harm beneficial insects. It’s most effective when applied directly to soil or plant wounds rather than on flowers where pollinators feed. Avoid applying to open blooms to minimize any potential impact on pollinators.
Q: Can cinnamon be used in organic gardening? A: Yes, cinnamon is considered compatible with organic gardening practices. It’s a natural substance that doesn’t leave harmful residues and breaks down naturally in the environment. However, if you’re certified organic, check with your certifying organization to ensure compliance with specific standards.
Q: Is cinnamon safe to use on edible plants? A: Cinnamon is generally recognized as safe (GRAS) by the FDA and can be used on edible plants. When applied to soil or as a deterrent around plants, it doesn’t significantly transfer to the edible portions. As with any treatment, wash produce thoroughly before consumption.
