Plants Poisonous To Horses 
Page 2
Some Common Plants Poisonous to Horses

Oleander
Diarrhea, colic, irregular heartbeat.
Roadsides, farmyards, plant cutting

Common groundsel
Head-pushing, incoordination, jaundice.
As a weed in first cutting alfalfa hay.

Bracken Fern
Incoordination, weakness.
Mountain pastures, regrowth on burnt ranges.

Tree tobacco
Excitement, tremors, 
shaking, paralysis.
Waste places abandoned lots.

Yellow star thistle
Inability to chew, starvation.
Grows extensively in waste places and poorly managed pastures

Fiddleneck
Head-pushing, incoordination, jaundice.
Weed in first cutting alfalfa hay and oat hay.

Locoweed
Incoordination, falling, 
aimless wandering.
Localized sites in foothills.

St John's-wort
Photosensitization.
Perennial herb in pastures, roadsides, dry soil.

Russian knapweed
Inability to chew, starvation.
Grows extensively in waste places and poorly managed pastures

Castor bean
Severe diarrhea, colic, shock.
Ornamental but grows wild in waste places. Seeds are the dangerous part.

Jimsonweed
Incoordination, rapid pulse,
convulsions.
Fields, pastures, waste places.

Yew
Acute collapse and rapid death.
Ornamental, evergreen shrub, grows as a hedge.

Rattlebox
Incoordination, walking in circles, jaundice.
Roadsides, fields.

Sudan grass, sorghum
Incoordination of the hind end, incontinence, bladder infection.

[Page 1][Page 2][Page 3]
Related article: Ingestion of Poisonous Plants