Bermudagrass Johnsongrass Medusahead Quackgrass Field Bindweed Sufur Cinquefoil Hoary Cress Oxeye Daisy Poison Hemlock Black Henbane Houndstongue St. Johnswort Diffuse Knapweed Russian Knapweed Spotted Knapweed Squarrose Knapweed Purple Loosestrife Perennial Pepperweed Saltcedar Leafy Spurge Yellow Starthistle Canada Thistle Musk Thistle Scotch Thistle Dalmatian Toadflax Yellow Toadflax Dyer's Woad Back to main weeds page   St. Johnswort Hypericum perforatum   Rosette Adult This perennial grows one to three feet tall. Stems are rust colored and woody at the base. Flower The flowers are bright yellow with five petals. Weed Infestation St. Johnswort was introduced from Europe. It invades areas with sandy or gravelly soils. Reproduction is by seeds and short runners. It contains a substance that is toxic (but rarely fatal) to white-haired animals causing them to develop skin irritations and often lose weight when exposed to sunlight. It is also a key ingredient of some popular dietary supplements. Leaf Leaves are characterized by prominent veins and transparent dots, visible when held up to light. Back to main weeds page