A holly-choked understory (left) blocks the sunlight and water native plants need to survive, leaving barren ground beneath. A healthy native forest floor (right) lets light through to support ferns, salal, Oregon grape, and other understory species.By Richard Saunders and Ross Baarslag-BensonLake Forest Park Tree BoardEnglish holly (Ilex aquifolium), also known as common holly, may look festive, but King County classifies it as a non-regulated …
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