How to Grow Mare's Tail
iNaturalist
Mare's Tail
Hippuris vulgaris
herbMare's tail is an aquatic or semi-aquatic perennial herb with distinctive whorled, needle-like leaves arranged in circles around slender stems. It grows in wetland environments and shallow water, reaching 12-24 inches tall. This unique plant has been used traditionally in herbal medicine and is valued for its ornamental appearance in water gardens.
When should you plant Mare's Tail in your zone?
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Example Mare's Tail timeline · Pittsburgh, PA (Zone 6b)
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Plant Mare's Tail
Around Apr 17Near Pittsburgh's average last spring frost.
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Tend & protect
Late spring–summerWatering, feeding, and pest-watch reminders.
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Harvest Mare's Tail
Around Apr 21≈ 4 days after planting
Sample dates for Pittsburgh, PA. Sign up to get exact Mare's Tail dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 3-8; hardy perennial in cold climates
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Get my Mare's Tail timeline →Growth Stages
Emergence
2-3 weeksNew shoots appear from rhizomes in spring; early growth shows thin, single stems
Ensure water level remains consistent; protect from disturbance as roots establish
Vegetative Growth
4-6 weeksStems elongate and whorled leaves develop in rings up the stem; plant grows taller and fuller
Maintain shallow water depth; no fertilizer needed if in nutrient-rich water; thin overcrowded stems if desired
Flowering
3-4 weeksTiny, inconspicuous greenish flowers appear in leaf axils near stem tips; flowers are small and often overlooked
Flowers are pollinated by wind; maintain stable water conditions; foliage remains ornamental
Seed Development & Dormancy
4-6 weeks, then dormancySmall seeds develop after flowering; plant may die back in late fall in colder zones or remain evergreen in mild climates
Allow seed heads to mature if propagation desired; provide winter protection in zone 3-4 by maintaining water depth
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Maintain healthy water ecosystem with predatory fish or aquatic invertebrates; avoid stagnant water
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Hand-remove if excessive; introduce snail predators like dragonfly nymphs; control not usually necessary
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Reduce excess nutrients; increase water circulation; add shade with floating plants; maintain balanced aquatic ecosystem
Uses
Traditional herbal remedy
MedicinalMare's tail has been used in traditional European medicine as a diuretic and astringent, particularly in herbal preparations for urinary and respiratory health. The plant contains silica compounds and flavonoids that have mild medicinal properties. [source]
Herbal infusions
CulinaryDried mare's tail can be steeped into herbal teas with a mild, slightly astringent flavor. It is sometimes blended with other medicinal herbs for wellness beverages. [source]
Natural abrasive cleaner
HouseholdHigh silica content in mare's tail stems makes it useful as a gentle natural abrasive for polishing and cleaning. Historically used to scour metal and clean delicate items. [source]
Aquatic habitat creation
WildlifeMare's tail provides shelter and oxygen for aquatic insects, fish fry, and other pond organisms. Its dense foliage creates ecological structure in water gardens and natural ponds. [source]
Ornamental water garden plant
CraftThe distinctive needle-like foliage and unique vertical growth pattern make mare's tail an attractive marginal or submersed plant for water features, small ponds, and aquariums. [source]
This is not medical advice. LizPlants is not a medical resource. Always consult a qualified healthcare professional before using plants medicinally.
Harvest Tips
Harvest aerial stems and leaves throughout the growing season (spring through fall) by cutting above the waterline. Best harvested in mid-summer when foliage is most robust. Cut material can be used fresh or dried by hanging in bundles in a well-ventilated area. For propagation, separate rhizomes in spring before growth begins.
Fun Facts
- 🌱 Mare's tail is one of the few remaining species of the ancient Equisetophyta (horsetail) family relatives, with a fossil record extending back over 100 million years.
- 🌱 The plant's high silica content gives it a slightly gritty texture and was historically used as 'scouring rush' to clean and polish pewter and copper.
- 🌱 Despite its name, mare's tail has no botanical relation to actual mare's tails; the name comes from its resemblance to a horse's tail with the whorled leaves acting like bristles.
Gardening Terms
New to gardening? Learn about terms used in this guide:
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