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Giant Horsetail

Equisetum telmateia ssp. braunii

perennial herb View on Calscape

Care

Sun

part shade

Water

moderate

Size

1–5ft tall

Native Range

Riparian and wetland areas of northern and central California from Humboldt County to San Luis Obispo County, near sea level to 3000 ft.

Care Guide

Planting

Plant Giant Horsetail in part shade in a location with consistently moist to wet conditions - it thrives in water features or wet habitats, so boggy areas or near ponds are ideal for the Bay Area. Plant in spring or early summer to give it time to establish before its growing season peaks in late spring through autumn. Space plants generously since the sterile stems can reach 3–5 feet tall and spread substantially with their branching growth habit.

After Planting

Water consistently to keep the soil wet or very moist throughout the growing season; this plant's preference for water features means it won't tolerate dry conditions. Expect the green sterile stems to die back in late autumn as the plant enters dormancy - this is normal and not a sign of trouble. The #1 mistake is underwatering: if you're planting this in regular garden soil rather than a wet habitat, you'll need to water far more frequently than typical Bay Area perennials to keep it happy.

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