WSU Extension

Hortsense

Weeds : Creeping Jenny :
(revision date: 4/7/2021)

Family: Primulaceae
Cycle: Perennial
Plant Type: Evergreen

Use Integrated Pest Management (IPM) for successful weed management.

Biology
Lysimachia nummularia, commonly called moneywort or creeping Jenny, is a low-growing, creeping ground cover which forms a leafy mat only 2-4" tall. Roots where leaf nodes come in contact with the soil. Thrives in damp soils which will often kill off other types of ground covers. It features rounded, slightly ruffled, leaves (to 3/4" diameter). Profuse, cup-shaped, bright yellow flowers (to 3/4" across) appear in early summer. Tolerates limited foot traffic. Plants spread by rhizomes and self-seeding in optimum growing conditions to form large colonies. Stems may root where leaf nodes touch the ground. Plants tend to be less invasive if grown in lean, somewhat dry soils, however best performance is in moist fertile soils.
Habitat
Lysimachia nummularia can be found in a variety of different habitat types; however, it grows most vigorously and poses the biggest threat in moist areas such as wet meadows, swamps, floodplain forests, stream banks, bottoms, ditches, roadsides and along the banks of small water bodies. It can form a mat-like growth capable of excluding more desirable native plant species. It is native to Europe but is now found across the United States and Canada.

Management Options

Non-Chemical Management
  • Maintaining a healthy planting or turf area to provide competition will prevent weed establishment.
  • If Creeping Jenny is established in your lawn it may take two seasons to eradicate it.
  • The plant can be hand pulled where practical. All stems and stem fragments should be removed from the area to prevent the stems from rooting again in the soil. Prolonged submergence will kill Creeping Jenny. At restoration sites, it can be controlled by establishing native grasses to shade it out. Mowing is not effective since Creeping Jenny adheres closely to the ground due to its many rooting nodes.
Select non-chemical management options as your first choice!

Landscape areas
  • glyphosate
  • trifluralin
  • products containing 2,4-D
Turf areas
  • products containing 2,4-D
  • 2,4-D + MCPP + dicamba
Bare ground areas
  • products containing 2,4-D
Images
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Caption: Creeping Jenny flower
Photo by: H. Zell
Caption: Creeping Jenny close-up
Photo by: D. Stang
Caption: Creeping Jenny
Photo by: D. Stang