Equisetum arvense

Equisetum arvense

Plant Family

Equisetaceae

Botanical Description

Field Horsetail is a perennial plant with two types of stems: fertile brown stems appearing in spring, and sterile green photosynthetic stems with whorls of thin branches appearing later, resembling a bottle brush.

Cautions

Not for long-term use without professional guidance. Contains thiaminase (may deplete vitamin B1). Not during pregnancy or breastfeeding. Caution with heart or kidney conditions.

Habitat

Fields, roadsides, railway embankments, disturbed ground, damp areas.

Harvest Instructions

Sterile green stems harvested in summer. Dry thoroughly.

Geographic Distribution

Northern hemisphere - Europe, Asia, North America.

Growth Conditions

Full sun to partial shade. Various soils but often indicates poor drainage. Very persistent.

Plant Size

20-50 cm

Effects on the Body

Very high in silica - supports bones, connective tissue, hair, and nails. Diuretic action. Traditional use for urinary complaints.

Active Constituents

Silica (up to 10%), flavonoids, saponins, phenolic acids, minerals (potassium, manganese).

Safety Information

Dosage

Tea: 2-4 g dried herb, simmer 15 minutes. Not for prolonged use. Take vitamin B supplements if using regularly.

Culinary Use

Young fertile stems were historically eaten in Japan and by Native Americans.

Folklore & Historical Use

Ancient plant family dating back 350 million years. Used to polish pewter and wood (hence name 'scouring rush').

Scientific Research

European Medicines Agency approves for minor urinary complaints and minor wounds. Contains silica compounds with proposed benefits for connective tissue. German Commission E approves as diuretic for edema.