An invasive species

Diffuse knapweed is considered an invasive species throughout North America, having established itself in many areas of the continent. C. diffusawas first identified from North America in 1907 when it was found in an alfalfa field in Washington State. The seeds had presumably been transported in an impure alfalfa seed shipment coming from somewhere in the species native range. Now present in at least 19 states in the United States, it has invaded all contiguous states west of the Rockies and additionally in Connecticut, Massachusetts, and New Jersey. Portions of western Canada have also been infested by this plant.
The plant is very resistant to drought, spreads quickly, and possesses other competitive advantages that have allowed it to establish and flourish in its introduced range. Areas in which diffuse knapweed has been established generally are plains rangelands or forest benchlands. Land that has been recently disturbed—by human or natural processes—is favored for the establishment of diffuse knapweed. It has the potential to prosper in semi-arid and arid environments and seems to favor light, dry, porous soils. Areas with large amounts of shade or high levels of water discourage diffuse knapweed growth. wiley x florida discounted dental care cheap spanish holiday