Sweet Autumn Clematis ( _Clematis terniflora_ ) is a popular, fast-growing vine known for its prolific, fragrant white blooms in late summer and early fall. It produces numerous small flowers that create a “fleece-like” appearance. Its vigorous growth is often utilized to cover fences, arbors, and other structures, enhancing outdoor spaces.
Understanding Sweet Autumn Clematis Toxicity
Sweet Autumn Clematis is considered toxic to both humans and animals. Its toxicity stems from protoanemonin, a natural compound in the Ranunculaceae (buttercup) family. When the plant’s tissues are damaged, such as through chewing or crushing, ranunculin converts into this irritant.
All parts of the plant, including leaves, stems, and flowers, contain these toxic elements. Leaves and sap contain the highest concentration. The toxicity is generally considered mild to moderate, causing irritation rather than severe systemic poisoning. The plant also has a very bitter taste, which often deters both humans and animals from consuming large amounts.
Recognizing Symptoms of Exposure
For humans, skin contact with the plant’s sap can result in contact dermatitis, causing redness, irritation, and burning. In some cases, skin blistering may also occur. Ingesting parts of the plant typically causes oral irritation, including burning and mouth pain. Digestive upset is common, such as nausea, vomiting, diarrhea, and abdominal pain.
Pets, including dogs, cats, and livestock, can exhibit similar symptoms if they come into contact with or ingest the plant. Common signs in animals include excessive drooling, vomiting, and diarrhea. While symptoms are generally mild, their severity can vary based on the amount ingested and the individual’s sensitivity.
Immediate Actions After Exposure
If skin contact with Sweet Autumn Clematis occurs, wash the affected area thoroughly with soap and water immediately. Wearing gardening gloves when handling the plant prevents irritation.
For human ingestion, rinsing the mouth thoroughly is recommended. Do not induce vomiting. Contact Poison Control immediately at 1-800-222-1222 in the U.S. for guidance. Provide details about the plant and the estimated amount ingested, if known.
If a pet ingests Sweet Autumn Clematis, contact a veterinarian or an animal poison control center without delay. The ASPCA Animal Poison Control Center can be reached at 888-426-4435, and the Pet Poison Helpline is available at 855-764-7661. Be prepared to provide information about the exposure, including the plant part involved and any observed symptoms.
Safe Handling and Prevention
When working with Sweet Autumn Clematis, wearing protective gear such as gloves and long sleeves is advisable to prevent skin irritation. Consider the placement of Sweet Autumn Clematis carefully within your garden, especially if children or pets have unsupervised access. Planting it away from high-traffic zones or areas where pets might graze can reduce the risk of accidental exposure. Educating family members, particularly children, about not ingesting unknown plants is a practical preventive measure.