Horseweed
Basic Information
Scientific Name: Erigeron canadensis (syn. Conyza canadensis)
Plant Family: Asteraceae
Conservation / Invasive Status: Not Evaluated
Geographic Range: Native to Northern New England
Safety Level: Generally Safe
Harvest Season: Late summer through fall (seeds), Summer through early fall (aerial parts)
Parts Used: Aerial Parts, Flowers, Leaves, Roots, Seeds
Scientific & Botanical Information
Active Compounds
Contains volatile oil, tannins, flavonoids, phenolic compounds. Key constituents include limonene, p-cymene, and myrcene in the essential oil. Traditionally valued for respiratory support.
What Science Shows
Traditional respiratory support agent. Modern research limited but supportive of traditional use patterns. Mechanisms likely involve volatile oil action on respiratory tissues and antispasmodic properties of tannins.
Growing in New England
Found throughout New England as common annual/winter annual. Prefers disturbed areas, fields, and waste ground. Can be prolific in suitable habitat. Traditional preparation involved aerial parts harvested mid-season.
Safety & Interactions
Well-tolerated traditional use. No significant contraindications reported. Mild diuretic properties suggest caution in severe fluid loss. Volatile oil content suggests respiratory benefits but not for prolonged internal use without practitioner guidance.
New England Specific
Common New England weedy annual with long history of traditional use. Readily available for bioregional herbalism applications. Historic use documented in New England ethnobotanical records.
Pharmacological Actions: Anthelmintic, Anti-inflammatory, Anticancer, Anticoagulant, Antifungal, Antimicrobial, Antioxidant, Astringent, Diuretic, Hemostyptic
Traditional Herbalism Information
Parts Used & Their Applications
Aerial parts (stems, leaves, flowers) harvested when plant in bloom. Traditionally gathered in mid to late summer when oil content peaks. Entire above-ground plant used, collected before seed maturation.
Preparation Methods
Dried herb prepared as infusion (steep 5-10 minutes, 1 teaspoon per cup), stronger decoction (simmer 10 minutes), or fresh plant tincture (alcohol extraction). Some traditions favor infusion for volatile oil preservation.
Traditional Applications
Native use for respiratory conditions and general respiratory health. Mild diuretic noted in traditional preparations. Settlers incorporated into respiratory formulas and teas. Traditional preparation for seasonal respiratory support and ease.
Modern Adaptations
Contemporary herbalists employ in respiratory blends alongside other respiratory-supporting plants. Used in tea mixtures for seasonal respiratory support. Occasionally included in tincture formulas for respiratory conditions. Valued for common availability and traditional efficacy record.
New England Specific
Commonly available wild plant providing accessible respiratory support. Self-sowing in disturbed soils makes it readily harvestable. Represents New England tradition of using abundant native weeds medicinally.
Harvest Notes
Aerial parts best harvested June-August when in bloom and oil content high. Aerial parts best harvested mid to late summer. Can be used fresh or dried for storage.
Traditional Uses: Diarrhea and dysentery treatment, Diuretic Support, Fever Reduction, Hemostatic (bleeding disorders), Respiratory Support, Wound Healing
Magical Correspondences Information
Magical Correspondences
Planetary: Mercury. Elemental: Air. Traditional associations: mental clarity, communication, swift movement, journeying.
Magical Intentions
Employed for mental clarity and focus. Air association supports journeying work and communication magic. Swift growth pattern reflects quick manifestation. Used in workings for clarity of thought and rapid change.
Ritual Uses
Burned as incense for clarity and communication enhancement. Carried for mental sharpness. Used in travel magic and messaging spells. Placed on altar for Mercury workings and intellectual pursuits.
Color Correspondences
Green (growth, vitality), yellow (clarity, communication), white (purification and new beginnings).
Sabbat Associations
Imbolc (new beginnings), Beltane (swift growth), Lammas (quick harvest), Mabon (gathering and preparation).
Traditional Lore & Folk Magic
As common weed, included in folk magic traditions. Swift growth and prolific nature symbolized rapid change and adaptability in magical work.
Combining with Other Plants
Pairs with mullein for respiratory support in magical working. Combine with mint for clarity enhancement.
Planetary Rulers: Mercury
Magical Intentions: Adaptability, Cleansing, Communication, Mental Clarity, Purification, Quick Action
Elemental Associations: Air
1 Moerman, D.E. (1998). Native American Ethnobotany. Timber Press.
2 Mills, S. & Bone, K. (2005). The Essential Guide to Herbal Safety. Elsevier.
3 Hoffmann, D. (2003). Medical Herbalism: The Science and Practice of Herbal Medicine. Healing Arts Press.
4 Peterson, L.A. & McKenny, M. (1968). A Field Guide to Wildflowers. Houghton Mifflin.