Land Plants - invasive

Policeman's Helmet (Impatiens glandulifera) on Aug 11, 2019

Submitter has sample
EDRR Status: Ongoing monitoring

Description of specimen

Plants 3-6’ tall; flowers are solitary, light pink to purple, 1” to 1 1/2” long with 5 petals, the top 2 petals fused. Stems have five red to somewhat red linear ridges. Leaves are mostly whorled in groups of 3, approx an inch to four inches long with reddish petioles. Leaves are linear with regularly serrated edges. Seed capsules are green 5/8” to nearly an inch long with five protruding lighter green lengthwise ridges.

Commentary

Pat, Thanks for the report! The P. Helmet is definitely starting to take hold on Neskowin Creek, especially below the 101 bridge. Luckily, there really isn't much of it upstream of 101, except at the first property.

We are currently forming a Neskowin volunteer group if you'd like to participate. Please email me at tillamookweeds@gmail.com.

In the meantime, "Pull, Pile, Stomp" is the best way to get rid of it. Some herbicides are also effective. If working on your own property, remember to get some natives planted after removal!

Thanks again and call me anytime!

-Troy
Tillamook SWCD
503-842-2848

Ray Monroe
Aug. 12, 2019, 3:46 a.m.

Location

Impatiens glandulifera lines the edge of Neskowin Creek on the privately owned property of Neskowin Creek RV Resort located at the address listed above. Coordinates are 45.09556, -12397756. On Hwy 101 north of Lincoln City, the access point is located on the west side of the highway between MP 98 and 99.

The approximated size of the infestation on this parcel of property is about 8500 square feet (0.2 acre).

Expert Reviewer

Ray Monroe
Tillamook County Soil & Water Conservation District

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