Garden Hyacinth
Hyacinthus orientalis
Horse
Moderate
Get veterinary advice the same day and remove access. Significant consumption of bulbs (foliage is only mildly toxic).
Equio informs, it does not diagnose. When in doubt, call your vet.
What to do now
- Antidote
- No specific antidote. Symptomatic and supportive treatment.
- Time to signs
- 30 minutes to a few hours
- Prognosis
- Good. Rarely fatal due to the deterrent effect of the first bite.
- Rinse mouth (if contact with bulb crystals)
- Provide soft hay
- Treat diarrhea with binders if necessary
Its ID card
- Height
- 20 cm – 40 cm
- Flowering
- March to May
- Toxic parts
- The bulb is highly toxic. The rest of the plant is much less so.
- Toxin
- Calcium oxalate crystals (raphides) and alkaloids (low dose Lycorine).
- Habitat
- Spring gardens, cemeteries, indoors (potted), compost heaps.
- Soil indicator
- Rich, well-drained soil with compost/sand.
- Regions
- Entire Europe (Mainly cultivated)
- In hay
- Yes — stays toxic once dried
- Palatability
- Low due to immediate irritation from calcium oxalate crystals in the bulb. Consumption quickly stops.
When the risk rises
March-May (flowering) and Autumn (planting/digging).
Spotting it in the field
Grape Hyacinth (Muscari), Squill (Scilla) (small wild hyacinths/clusters, also slightly toxic). — smell : highly fragrant flowers, sweet and pleasant scent.
- Rosette of short, thick, fleshy, clasping leaves at the base
- Single, stout flower stalk (15-20cm)
- Very dense cluster of highly fragrant star-shaped flowers (pink, blue, white, mauve)
- Large, scaly bulb (purplish or white scales)
Signs to watch for
Acute toxicity.
Dose : Several bulbs for a significant effect. Foliage is mildly toxic.
- Severe hypersalivation
- Diarrhea (sometimes containing blood)
- Mild spasmodic colic
- Depression, total loss of appetite
- Irritation of the mouth and throat (horse refuses to drink)
Who is affected
Other species : Toxic to dogs who love to dig up bulbs. Human peeling of the bulb can trigger eczema (bulb itch).
In pregnant mares : not specifically documented.
Getting rid of it
Method : Dig up bulbs wearing gloves, especially before flowering. Destroy bulbs by burning or deep burial.
- Avoid planting hyacinths in or near paddocks.
- Supervise horses during gardening activities or compost cleanup.
- Educate owners about the dangers of spring bulbs.
Frequently asked questions
Can Equio identify Garden Hyacinth from a photo?
It can help organize visual clues, but plant identification must remain cautious when horse health is at stake.
Is Garden Hyacinth dangerous in hay?
This entry flags hay vigilance. Isolate suspicious forage and ask for professional advice if exposure is possible.
This page is informational. If ingestion is likely, if signs appear, or if the horse is fragile, contact a veterinarian immediately.