Plant
Garlic Mustard
Alliaria petiolataAlso known as Jack-by-the-Hedge, Poor Man's Mustard, Garlic Root, Hedge Garlic
Garlic mustard operates as a biennial forest invader that spends its first year as a low evergreen rosette before bolting into a flowering stalk early in its second spring. Its roots exude glucosinolates and allelopathic chemicals into the surrounding soil, actively disrupting mycorrhizal fungal networks that native hardwood trees and wildflowers depend upon. Dense stands outcompete native groundcover and leaf out before the woodland canopy closes, dominating available light and nutrients.
InvasiveBiennialForest Understory
—observations
—countries
—peak records
Least ConcernConservation statusIUCN Red List categoriesLCNTVUENCREWEXLeast ConcernRed List categories, explained →
Diet & preyPhotosynthetic
Predators
- White-Tailed Deer
- Garlic Mustard Root Miner
- Cabbage White Butterfly
ThreatsTargeted eradication via pulling, mowing before seed set, and selective herbicides
HabitatsDeciduous woodlands, riverbanks, forest edges, and disturbed roadsides
Life span2 years
Classification
- OrderBrassicales
- FamilyBrassicaceae
- GenusAlliaria
- SpeciesAlliaria petiolata
Range data is not available yet.
Interaction riskLow
- Low
- Moderate
- High
- Very high
- Why interaction risk is low
- Safe to observe at a normal distance.
Responsible observation
- Scent Test: Crush a small piece of foliage to detect the pungent garlic and onion aroma useful for identification.
- Removal Etiquette: Uproot the entire S-shaped taproot before seed pods mature, and bag plants to prevent spread.
- Rosette Scouting: Check woodland floors in late autumn and winter for heart-shaped, scalloped basal leaves that stay green.
Ecological Sink (c) Michael J. Papay, some rights reserved (CC BY) · cc-by
Native Competitor (c) Judy Gallagher, some rights reserved (CC BY-SA), uploaded by Judy Gallagher · cc-by-sa
Host Forest Canopy (c) James St. John, some rights reserved (CC BY) · cc-by
Same Family (c) NY State IPM Program at Cornell University, some rights reserved (CC BY) · cc-by
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