Cats & Dogs
Generally safeConsulted references do not classify the plant as toxic for that pet type, while still allowing for mild GI upset if large amounts are chewed.
Verified against ASPCA/provenance audit 2026-05-06 on May 6, 2026.
Sources
Pet safety reference
Water Hyacinth
Eichhornia crassipes
Water Hyacinth is a free-floating aquatic plant known for its striking lavender flowers and bulbous, air-filled leaf stalks. While it is considered non-toxic, its fibrous nature can occasionally cause mild digestive upset if consumed in large quantities.
Eichhornia crassipesFloating Water HyacinthWater Hyacinth
- Light
- Full sun to partial shade
- Habit
- Floating aquatic
- Care
- High (invasive in many regions)
Safety status
If a pet has chewed or swallowed plant material and is showing symptoms, contact a veterinarian or poison resource immediately. This product is for structured reference, not diagnosis.
Cats — concern notes
Common signs
No specific toxicity symptoms are expected, though chewing or swallowing plant material may still cause mild stomach upset.
Escalation note
This plant is listed by ASPCA as non-toxic for this pet. Monitor for digestive upset after large ingestion and contact a veterinarian if symptoms persist.
Dogs — concern notes
Common signs
No specific toxicity symptoms are expected, though chewing or swallowing plant material may still cause mild stomach upset.
Escalation note
This plant is listed by ASPCA as non-toxic for this pet. Monitor for digestive upset after large ingestion and contact a veterinarian if symptoms persist.
Source evidence
ASPCA Toxic Plant List
toxicology · 99% reliability
Water Hyacinth is listed as non-toxic to cats and dogs.
NC State Extension Plant Toolbox
botanical · 94% reliability
Eichhornia crassipes is a perennial aquatic herb often used in water gardens.
Questions about Water Hyacinth
Is water hyacinth toxic to cats?
Water hyacinth (Eichhornia crassipes) is listed as non-toxic to cats by the ASPCA, so it is not expected to cause poisoning. That said, non-toxic does not mean harmless in large quantities — the plant's fibrous material can still cause mild stomach upset if your cat chews or swallows a significant amount.
What happens if my cat eats water hyacinth?
No specific toxicity symptoms are expected. At most, chewing or swallowing plant material may trigger mild digestive upset such as vomiting or loose stools, particularly after a large ingestion.
How much water hyacinth would make a cat sick?
Water hyacinth is not toxic to cats, so there is no poisonous threshold the way there is with harmful plants. However, the fibrous stalks and leaves can cause GI irritation in larger amounts — any noticeable vomiting or lethargy after eating it warrants a call to your vet.
What should I do if my cat ate water hyacinth?
Monitor your cat for signs of digestive upset such as vomiting, diarrhea, or lethargy. Because the plant is non-toxic, serious effects are not expected, but if symptoms persist or worsen, contact your veterinarian.
Is water hyacinth toxic to dogs?
No, water hyacinth (Eichhornia crassipes) is listed as non-toxic to dogs by the ASPCA. It is considered generally safe, meaning exposure is unlikely to cause serious harm.
What happens if a dog eats water hyacinth?
No specific toxicity symptoms are expected, but chewing or swallowing plant material may cause mild stomach upset, particularly if eaten in large quantities due to the plant's fibrous nature.
How much water hyacinth is dangerous for a dog to eat?
Water hyacinth is non-toxic, so no dangerous dose threshold exists; however, large ingestions can cause digestive upset from the fibrous plant material. Non-toxic does not mean safe to eat freely — if your dog consumed a significant amount, monitor for vomiting, diarrhea, or lethargy.
What should I do if my dog ate water hyacinth?
Monitor your dog for signs of digestive upset such as vomiting, diarrhea, or decreased appetite. Because the plant is non-toxic, serious harm is unlikely, but contact your veterinarian if symptoms persist or your dog seems uncomfortable.
Same safety verdict
Other plants with the same verdict
Cosmos
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Generally safe for cats & dogs.
Calathea
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Calathea are popular tropical houseplants known for their striking, patterned foliage and rhythmic leaf movement. They are considered safe for households with pets, though ingestion of large amounts of fibrous plant material may cause minor digestive discomfort.
Generally safe for cats & dogs.
Dwarf Date Palm
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Generally safe for cats & dogs.
Hanging Lobster Claw
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Heliconia rostrata is a tropical perennial known for its dramatic, pendulous inflorescences. While generally considered non-toxic to pets, ingestion of any plant material can cause gastrointestinal upset.
Generally safe for cats & dogs.
Same growing conditions
Plants for the same room
Buttercup
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Cinquefoil
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Nasturtium
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Nasturtium is a popular, fast-growing annual known for its edible, peppery-flavored flowers and rounded leaves. It is widely considered safe for household pets, though large ingestions of fibrous plant material may occasionally cause mild digestive upset.
Generally safe for cats & dogs.