Field Horsetail

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Field Horsetail

Image from MilkaS

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.

Field Horsetail

Image from tamaki

Concern Level

Only during drought conditions, unpalatable, can be incorporated into hay.

Toxic Parts

All parts of the plant are toxic, fresh or dried.

Field Horsetail

Image from yksin

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.

Field Horsetail

Image from hesselink

More Information

University of Wisconsin

*It should be noted that we are not veterinarians. This information is written specifically for horses and should be used for reference purposes only. If you think your horse has eaten something toxic call your vet right away.

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