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Is Morning-Noon-and-Night toxic to cats?

YES (TOXIC)
Unfortunately, Morning-Noon-and-Night is toxic and potentially harmful to cats. We recommend you keep your feline friends away from this plant. See the table below for more information.
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Additional Names:Yesterday, Today, Tomorrow, Kiss-Me-Quick, Lady-of-the-Night, Fransiscan Rain Tree
Scientific Name:Brunfelsia species
Family:Solanaceae
Toxic Principles:Brunfelsamidine
Clinical Signs:Tremors, seizures (for several days), diarrhea, vomiting, hypersalivation, lethargy, incoordination, coughing
If you think your cat may have ingested a poisonous substance, call 888 426 4435 or your local vet
Detailed Write-up
Author:
Alec
Last Updated:
7/13/25

Is Morning-Noon-and-Night Toxic to Cats?

Cats are wonderful pets that bring joy and company to millions of households across the world. As a cat owner, you want to make sure that you are providing the best possible care and nutrition to your furry friend. One of the things that you need to know is whether certain foods or substances that are safe for humans could be harmful to your cat. One area of concern for cat owners is the use of Morning-Noon-and-Night (MNN) herbicide, which is commonly used to kill weeds and grass.

What is MNN?

MNN is a post-emergent, systemic herbicide that contains the active ingredient Triclopyr. It is used to control broadleaf weeds and woody plants in lawns, gardens, and other outdoor areas. MNN can be found in many commercial weed killers and is usually applied as a spray. It works by being absorbed through the leaves of the targeted plants and then translocated throughout the plant, ultimately killing the root system.

Can MNN be toxic to cats?

The safety of MNN for cats is a topic of ongoing debate. While some studies have suggested that cats may be sensitive to Triclopyr, others have found no evidence of toxicity. However, it is known that cats are more vulnerable to certain toxins than humans or other animals due to differences in their metabolic pathways and organ systems.

According to the ASPCA Animal Poison Control Center, Triclopyr has a low toxicity level for cats. Ingestion of small amounts may cause mild gastrointestinal upset, such as vomiting and diarrhea, but these symptoms usually resolve on their own within 24-48 hours. However, if a cat ingests a large amount of MNN, more serious symptoms could occur, such as difficulty breathing, seizures, and liver damage. In such cases, immediate veterinary care is necessary for a positive outcome.

Preventing MNN toxicity in cats

The best way to prevent MNN toxicity in cats is to avoid exposing them to the herbicide in the first place. If you use MNN to control weeds and other unwanted vegetation in your yard, make sure that your cat is kept away from the treated area until the herbicide has dried completely. You may also want to consider using alternative methods for weed control that are less toxic to cats, such as manual pulling or the use of natural weed killers.

It is also important to store MNN and other pesticides in a secure location that is inaccessible to cats and other pets. Make sure that the products are stored in their original containers and labeled clearly, so that you can quickly identify them in case of an emergency.

What to do if your cat has been exposed to MNN

If you suspect that your cat has ingested or come into contact with MNN, it is important to act quickly. Contact your veterinarian or the ASPCA Animal Poison Control Center immediately for guidance on how to proceed. If your cat is experiencing severe symptoms, take them to the nearest animal hospital or emergency clinic for treatment.

Your veterinarian may recommend inducing vomiting or administering activated charcoal to help reduce the absorption of the herbicide. In more severe cases, supportive care such as intravenous fluids and medications to support liver function may be necessary.

Conclusion

In conclusion, MNN can be toxic to cats if ingested in large quantities, though the herbicide is generally considered safe for felines. As a cat owner, it is important to take precautions to prevent your pet from coming into contact with MNN and other pesticides. If you suspect that your cat has been exposed to MNN, contact your veterinarian or the ASPCA Animal Poison Control Center immediately for guidance.

By being aware of the potential risks and taking proactive steps to minimize them, you can help keep your feline friend healthy and happy for years to come.

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