Invasive Plant Species PHWS INVASIVE PLANT SPECIES PHWS Common Periwinkle PHWS Scotch Broom PHWS Purple Loosestrife PHWS Orange Hawkweed PHWS Leafy Spurge PHWS Japanese Knotweed PHWS Himalayan Blackberry PHWS Giant Hogweed PHWS English Ivy PHWS English Holly PHWS Yellow Flag Iris PHWS Yellow Archangel
