Himalayan and evergreen blackberry species are introduced from Eurasia (~1885) and currently dominate many regions of the Pacific Northwest. Both tend to form impenetrable thickets due to spreading vines with very prickly stems. Himalayan blackberry is generally more widespread than its evergreen cousin. However, both species are a cause for concern as they are extremely competitive on disturbed sites, degrading the quality of riparian habitats along with fence lines, roadsides, and forest edges. In the Lower Mainland, blackberries deteriorate valuable stream habitat by preventing the establishment of deep-rooted native shrubs, which are a critical for healthy streams, providing food, shade, and bank stability. However, blackberry shrubs do offer limited food, nesting sites, and wildlife cover (and make great blackberry pies!). Evergreen and Himalayan blackberry are extremely difficult to remove as they grow very fast and have efficient reproductive success. Nevertheless, stands can be controlled through vigorous cutting, planting, and monitoring efforts as outlined in the sections below.