What are invasive plants… and what’s the big deal?
Most invasive plant species are introduced to North America from Europe or Asia. They may come accidentally, or they may have been brought in on purpose. Examples of accidental introduction include the transport of seeds or plants in the ballast of ships, in the fleece and hair of livestock, in clothing, and as contaminants in seed lots. Intentional introductions are made for reasons including erosion control, ornamental plants, forage, medicine and dyes, to name a few. • Invasive plants are distinguished from other unwanted plants by their ability to spread (invade) into native ecosystems. • In the western United States, invasive species have been spreading at a rate of about 4,600 acres per day on federal lands. • Oregon State Department of Agriculture estimates indicate that existing and potential invasive plants are costing Oregon citizens a total of about $100 million per year. • Invasive plants are typically non-native, however, not all non-native plants are invasive. The terms a
