Dalmation toadflax is a wide spread invasive. The extent of it’s spread can be seen in this map from the Natural Resources Conservation Service. Originally brought to North America from the Mediterranean region of Europe as an ornamental, Dalmatian toadflax is currently found in at least 34 states in the U.S. and most of the

Like other creeping perennials, the key to Russian knapweed control is to stress the weed and cause it to expend nutrient stores in its root system. An integrated management plan should be developed that places continual stress on the weed. Currently, the best management plan includes cultural control combined with mechanical and/or chemical control techniques.

This is often a favorite to hate in the central Arizona highlands. Knapweed is a pioneer species found in recently disturbed sites or openings. Once it has been established at a disturbed site, it continues to spread into the surrounding habitat. This species outcompetes natives through at least three methods: A tap root that sucks up water

Malta starthistle (synonyms: Napa starthistle, tocalote) is an annual invasive weed with foliage and winged stems that are grayish to green in color. Its thistle-like appearance is similar to yellow starthistle (C. solstitialis), but Malta starthistle is distinguished by smaller yellow flowers and longer seedpods that are armed with relatively short spines (less than 1/2

From the CA Extension offices: Sweet resinbush (Euryops subcarnosus) is an exotic species from South Africa that was introduced in Arizona during the 1930’s. It was brought here in hopes that it would provide forage for livestock and aid in slowing soil erosion. Potted plants were sent to Civilian Conservation Corps camps in 1935 where

From the Wikipedia entry on this invasive weed: Onopordum acanthium (Cotton thistle, Scotch thistle), is a flowering plant in the family Asteraceae. It is native to Europe and Western Asia, from the Iberian Peninsula east to Kazakhstan, and north to central Scandinavia, and widely naturalized elsewhere. It is a vigorous biennial plant with coarse, spiny

Tamarix is perhaps one of our better know invasive species. It is found widely throughout the Southwest. The description below comes from Wikipedia, where you can read more in depth on the subject. They are evergreen or deciduous shrubs or trees growing to 1–18 m in height and forming dense thickets. The largest, Tamarix aphylla, is an evergreen tree that can grow to 18

Join Prescott Creeks on an invasive species removal spree. We’ll teach you about the invasive plants, why they’re the bad-nasties we want out of the watershed, what they’re doing to the habitat and water quality, and what you can do about and to them. Then, we’ll take up all of their space by seeding native