On edge of neigborhood and shorepine dune forest. Looks like one big old patch planted as an ornamental in the past is the source, with numerous (at least 100+) seedlings sprouting up along trails and under the forest canopy. At least 4 acres infested, probably more.
Expert Reviewer
Tania Siemens WISE Program Coordinator (Watershed and Invasive Species Education) Oregon Sea Grant Extension Oregon State University tania.siemens@oregonstate.edu 541-914-0701