Lemon verbena is classified as toxic to dogs by the ASPCA, but the risk is relatively low. The plant’s essential oils can cause stomach upset and colic if a dog eats a significant amount of the leaves or stems. Small amounts, such as traces used in cooking or as a flavoring agent, are not considered a concern.
Why Lemon Verbena Is Listed as Toxic
The toxic component in lemon verbena (Aloysia triphylla) is its essential oils, which are concentrated in the leaves and give the plant its strong citrus scent. These oils can irritate a dog’s digestive tract, leading to stomach pain and cramping. The plant belongs to the Verbenaceae family and is sometimes sold under the name “lemon beebrush.”
This is not a plant that poses a life-threatening risk in most scenarios. The ASPCA specifically notes there are “no concerns if small amounts used in cooking or as flavoring agent,” which puts it on the milder end of the toxic plant spectrum. The danger increases with the quantity consumed and, more importantly, with the concentration of the essential oils involved.
Fresh Leaves vs. Essential Oil
There is a meaningful difference between a dog nibbling on a lemon verbena plant in your garden and a dog being exposed to concentrated lemon verbena essential oil. Fresh leaves contain relatively dilute levels of the irritating oils. A few chewed leaves may cause mild stomach discomfort or no symptoms at all.
Concentrated essential oils are a different story. The Merck Veterinary Manual states plainly that the higher the concentration of an essential oil, the greater the risk to the animal. Concentrated essential oils should never be applied directly to pets. This applies to lemon verbena oil as well as other popular plant-based oils. If you use essential oils in a diffuser or for household purposes, keep the bottles stored where your dog cannot reach them. A spill or a chewed-open bottle can deliver a much larger dose of irritating compounds than a whole garden’s worth of fresh leaves.
Signs to Watch For
If your dog eats lemon verbena leaves or has contact with the essential oil, the typical signs are digestive in nature:
- Stomach upset: vomiting, drooling, or loss of appetite
- Colic: abdominal pain, restlessness, or whimpering when the belly is touched
These symptoms usually appear within a few hours of ingestion. In most cases involving fresh plant material, the discomfort is mild and passes on its own. If your dog consumed a large quantity of leaves, or any amount of concentrated essential oil, the symptoms can be more pronounced and persistent.
What to Do After Ingestion
If your dog ate a leaf or two from a lemon verbena plant, monitoring at home is usually sufficient. Watch for vomiting, diarrhea, or signs of belly pain over the next several hours. Make sure fresh water is available.
For larger amounts, or if your dog got into concentrated essential oil, calling your vet or a poison control hotline is the right move. Have this information ready: roughly how much your dog ate, when they ate it, and your dog’s approximate weight. This helps determine whether the situation calls for an office visit or continued monitoring at home. Do not try to induce vomiting on your own. Making a dog vomit is sometimes helpful but sometimes harmful, depending on what was swallowed, and a professional can tell you which applies to your situation.
In cases where a vet determines treatment is needed, the approach is typically supportive: preventing further absorption of the irritant and managing nausea or pain until the oils pass through the system.
Don’t Confuse It With Lemon Balm
Lemon verbena and lemon balm (Melissa officinalis) are frequently mixed up because they share a similar citrusy smell and are both common in herb gardens. They are completely different plants from different families. Lemon balm has broader, rounder leaves with a crinkled texture, while lemon verbena has long, narrow, pointed leaves on woody stems. If you’re trying to identify which plant your dog got into, the leaf shape is the easiest way to tell them apart. Lemon balm is listed as non-toxic to dogs by the ASPCA, so correct identification matters.
Keeping Your Garden Dog-Safe
If you grow lemon verbena and have a dog, you don’t necessarily need to rip the plant out. The risk from occasional nibbling is low. A sensible approach is to place the plant in a spot your dog doesn’t frequent, or use a small raised bed or container that’s out of easy reach. Dogs that tend to chew on plants out of boredom or curiosity are at higher risk than dogs that generally ignore garden greenery.
The bigger concern is storage. Dried lemon verbena leaves (common for tea), essential oils, and concentrated extracts should be kept in closed cabinets. A sealed bag of dried leaves is more potent per bite than a fresh leaf on the stem, and essential oil is dramatically more concentrated than either.