Is Red Squill Poisonous? – Toxicity to Humans, Dogs, and Cats

Yes - red squill is highly poisonous. The plant contains scilliroside, a potent cardiac glycoside, and every part of it is toxic. The bulb carries the highest concentration. That said, most humans and domestic pets can vomit after eating it, which often expels enough toxin to prevent a lethal dose. Rats cannot vomit, which is precisely why red squill became a classic rodenticide.

What Is Red Squill?

Red squill goes by several names: Drimia maritima, Urginea maritima, and Scilla maritima. You may also hear it called sea squill, sea onion, or maritime squill. It grows wild across the Mediterranean Basin and has naturalized in parts of California and Australia.

The plant is striking in appearance. It produces a large bulb - sometimes over 1 kilogram - with fleshy, lance-shaped leaves. In late summer, a tall flower stalk shoots up, bearing dozens of white to pale pink blossoms. After flowering, the leaves die back and the plant enters dormancy.

Red squill is not the same as Siberian squill (Scilla siberica), a low-growing spring bulb with blue drooping flowers that is not considered significantly toxic. Silver squill (Ledebouria socialis) is another unrelated plant with striped leaves and only mild toxicity. Make sure you have the right plant before drawing any safety conclusions.

What Parts Are Toxic?

The bulb is the most dangerous part. It concentrates scilliroside and related cardiac glycosides in a way that dwarfs every other part of the plant. The roots are also toxic, though less potent. The leaves carry the lowest toxin levels, but they are not safe.

Toxicity fluctuates seasonally. The bulb is at its most potent during the summer dormancy period and again when the plant is flowering or setting seed. Treat all parts as dangerous at all times.

Toxic Compounds: What Makes Red Squill Dangerous?

The primary toxin is scilliroside, a bufadienolide cardiac glycoside. Other cardiac glycosides present include proscillaridin A and scillaren A. These compounds disrupt calcium regulation in heart muscle. The result: irregular heartbeats, slowed heart rate, and in severe cases, cardiac arrest from hyperkalemia.

Scilliroside’s action on the heart is why it works as a rodenticide. Rats lack a functional vomiting reflex. Once they swallow the toxin, it stays down. Humans, dogs, and cats can vomit after ingestion - their bodies recognize the irritant and expel it before the full dose takes hold. That biological difference is the reason red squill kills rats while being merely dangerously toxic to most other mammals.

Symptoms of Red Squill Poisoning

Symptoms vary by species and dose. Below is a practical breakdown.

Humans:

• Abdominal pain and cramping
• Nausea and vomiting
• Diarrhea
• Irregular heartbeat and low blood pressure
• Dizziness and confusion
• Hyperkalemia in severe cases
• Convulsions and cardiac arrest at high doses

Dogs and cats:

• Vomiting (the most common sign - and usually a good sign that the body is reacting)
• Diarrhea, sometimes with blood
• Lethargy and weakness
• Loss of appetite
• Cardiac irregularities: arrhythmia, bradycardia
• Tremors and seizures in serious cases

Children: Children face elevated risk because they may consume a significant amount before anyone notices. Symptoms resemble those in adults, but the threshold for serious harm is lower. Any suspected ingestion in a child is a medical emergency.

Note: even cases that do not reach lethal dosing can cause hyperkalemia and lingering cardiac complications. A veterinarian or physician must evaluate any exposure.

What to Do If Someone Is Exposed

If red squill has been eaten, act fast.

1. Do not induce vomiting unless a medical professional explicitly tells you to. Some cardiac glycosides cause additional harm coming back up.
2. Call poison control: US: 1-800-222-1222 (or your regional equivalent). Have the plant specimen or a photo ready - correct identification matters.
3. For children: call emergency services or go to the nearest emergency room immediately. Do not wait for symptoms to develop.
4. For pets: contact your veterinarian right away. After-hours pet poison hotlines exist for a reason - use them. Be ready to describe the plant part, estimated quantity, and time of ingestion.
5. Bring whatever you have of the plant to the appointment or ER. Identification speeds up treatment.

Safe Handling and Garden Safety

Red squill is sometimes planted as an ornamental or kept as a curiosity. Handle it with care.

Wear gloves when working with the bulbs. The sap irritates skin and can cause contact dermatitis in sensitive individuals.

Keep red squill out of gardens and yards accessible to young children or pets that roam. If you have a garden with pets or small children, choose non-toxic ornamental alternatives. Marigolds, snapdragons, zinnias, and gerbera daisies deliver color without cardiac glycosides.

If you use red squill for rodent control, store the bulbs in locked cabinets. Physical barriers - raised beds, enclosed planters - offer the best protection in multi-use gardens.

Frequently Asked Questions

Is red squill more dangerous to pets than to humans?

Both are at risk, but the biology differs. Dogs and cats can vomit, which gives them a protective edge rats do not have. Even so, red squill is toxic to all of them. The emetic response is not guaranteed protection - it is a factor, not a guarantee.

Can I grow red squill safely if I have dogs?

No. Locked raised beds and constant supervision reduce the risk but do not eliminate it. If you have dogs, choose a different ornamental.

What is the difference between red squill and Siberian squill?

Red squill (Drimia maritima) is large, toxic, and produces tall white-to-pink flower spikes. Siberian squill (Scilla siberica) is small, spring-blooming, and has blue drooping flowers. They are botanically distinct and differ dramatically in toxicity.

Is the plant dangerous if I just touch it?

Skin contact causes irritation from the sap - wear gloves. Ingestion of any plant part is the real risk. Even small ingestions warrant a call to poison control.

Can birds or livestock be affected?

Yes. Birds are susceptible to cardiac glycosides. Livestock - particularly goats and sheep - may graze on it with fatal results. Livestock owners in Mediterranean-climate regions should treat red squill as a serious pasture risk.