Cowbane

Cowbane is a carrot-family plant of wetlands, streambanks, and rice-paddy edges, and the whole plant — especially the roots — contains the neurotoxin cicutoxin. It's among the fastest-acting of all known plant poisons, so even a small amount can escalate rapidly to tremors, seizures, and respiratory depression.

Telling it apart from similar carrot-family plants

Cowbane (Cicuta) is in the same genus as spotted water hemlock; both share cicutoxin and pose essentially the same danger. Poison hemlock, by contrast, is in the same family but carries a different, coniine-type toxin. Above all, cowbane closely resembles edible water dropwort, a look-alike that has caused fatal foraging mistakes — so never pick or feed an unfamiliar water plant that resembles it.

How cats get exposed

You'd never bring it indoors, but exposure happens on walks and outings. It grows in stands near water, and the roots are especially dangerous. A cat can be exposed by chewing an unfamiliar waterside plant or licking an uprooted root.

How symptoms progress

Cicutoxin acts very fast: signs usually begin a short time after ingestion with diarrhea and tremors, then quickly progress to seizures, sometimes with dilated pupils and fever. What follows is respiratory depression — the drive to breathe itself weakens — and at that stage it can be fatal. By the time symptoms appear, the situation is often already critical.

What to do right now

If your cat may have chewed an unfamiliar carrot-family plant by water, get to a vet immediately even without symptoms — it moves so fast that every minute counts. Reaching the clinic before seizures begin is key; if you can, bring a photo or a piece of the plant to show the vet.