This unsuspecting flowering plant is actually a weed that costs Oregon an estimated $47 million annually in timber production loss. It tends to rapidly establish in areas that have been disturbed or where nothing is growing. This plant is widespread on the Oregon coast and in the Willamette Valley.
Some plants produce up to 12,000 seeds per year and the seeds can survive 50+ years. It is an extremely persistent plant.
What to do:
The best removal practice is to use gardening shears to cut the main stem at the soil level. Be careful not to leave excess stem or the plant will re-sprout. In order to prevent regrowth, cover the stem and root system with soil followed by cardboard and 3″ of straw in order to prevent seeds from obtaining sunlight.