Rough Horsetail (Equisetum hyemale)

Rough Horsetail

Equisetum hyemale

Its jointed, bamboo-like stems bring structured green to damp spaces. Evergreen perennial rush; common names: Rough Horsetail, Scouring Rush.

Partial sun
2–3/week
Moderate
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Plant Needs

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Sunlight Prefers bright indirect light or partial shade; avoid intense direct sunlight which can scorch the delicate stem ridges
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Watering Keep soil consistently damp, as the plant requires moist conditions; avoid allowing the growing medium to dry out completely
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Temperature Hardy to freezing temperatures down to 0°C; avoid prolonged exposure to temperatures above 28°C to prevent heat stress
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Characteristics

  • Stem: Segmented, hollow, bamboo-like stems with rough, silica-rich ridges
  • Foliage: Reduced to small, scale-like leaves fused tightly around stem nodes
  • Sporangia: Cone-shaped strobili at stem tips to release spores in spring
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Care Guide

Watering

Maintain evenly moist soil; mist stems periodically to boost ambient humidity

Fertilization

Apply diluted balanced liquid fertilizer once monthly. Avoid high-nitrogen fertilizers, which can cause leggy, unstable stems

Composted banana peel tea:Fully compost banana peels first, dilute the resulting tea 1:20 with water, and apply as a root drench to avoid mold or odor buildup
Pruning
  • Trim yellowing or browning stems at the base to maintain a tidy, uniform appearance
  • Thin overcrowded clumps in early spring to improve airflow and reduce disease risk
  • Remove spore-producing strobili if self-seeding in garden beds is unwanted
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA: Contains thiaminase, which breaks down vitamin B1; chronic ingestion causes thiamine deficiency

Humans: Ingestion of large amounts may cause mild gastrointestinal upset due to silica and thiaminase content

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Garden Uses & Culture

Culture: Historically used for scouring metal and polishing wood due to its silica-rich stems; symbolizes resilience in damp, low-light environments

Usage: Ornamental for bog gardens, water features, and damp indoor containers; limited traditional medicinal use is not recommended due to toxicity risks