Field Horsetail
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Field Horsetail
Names: Equisetum species, horsetail, scouring rush
Description: Both a perennial and an annual that grows to 6 feet, with two types of stems. Sterile stems are light green with many branches and no leaves. Fertile stems are singular, darker green, ridged, hollow, with distinct joints.
Young shoots appear with a tan spore cone on the end.
Concern level: Only during drought conditions, unpalatable, can be incorporated into hay.
Toxic parts: All parts of the plant are toxic, fresh or dried.
Symptoms: Jaundice, weight loss, general weakness, lack of coordination, anxiety and paralysis, convulsions and death.
Danger: Contains Thiaminase that breaks down thiamine, which affects central nervous system and metabolism. Especially dangerous to young horses, can be fatal.
More information: University of Wisconsin
Poisonous plants by letter
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
Q
R
S
T
U
V
W
X
Y
Z
Looking for a plant but don't know the name? Try the toxic plant identifier
This information is for reference only, if you think your horse has eaten something toxic, call your vet right away.
