Category Archives: Noxious Weeds

Hairy Pink

Hairy pink (Petrorhagia dubia) is native to Southern Europe and the Mediterranean. It has been introduced and has spread throughout South America, Australia and Africa. In North America this annual was brought to California in the 1920s and was first … Continue reading

Posted in Noxious Weeds, Wildflowers | Tagged , , , , | Comments Off on Hairy Pink

Pinnate Tansymustard

Pinnate tansymustard (Descurainia pinnata) is found throughout all of North America. This native annual (or winter biennial) grows in sunny disturbed sites with poor soil up to about 8,000 feet. Variable in appearance, there are as many as ten subspecies. … Continue reading

Posted in Noxious Weeds, Wildflowers | Tagged , , , | Comments Off on Pinnate Tansymustard

Bur Buttercup Fruits

Bur buttercup (Ceratocephalus testiculatus, formerly Ranunculus testiculatus) is one of our earliest wildflowers to bloom, appearing immediately after the snow melts. It is also very short-lived. Once it appears, it is only days before the fruits are mature and the … Continue reading

Posted in Noxious Weeds, Wildflowers | Tagged , , | 3 Comments

Redclaws

Redclaws (Escallonia rubra) is native to Chile and Argentina. This shrub is used as an ornamental throughout the world. In North America it has naturalized along the coast in Oregon and Northern California. Tolerant of salt spray, redclaws is found … Continue reading

Posted in Noxious Weeds, Shrubs | Tagged , | 3 Comments

Bull Thistle

Due to its size, spines and rapid spread, bull thistle (Cirsium vulgare) is considered an aggressive weed or noxious plant. Its seeds are wind dispersed, are viable for over ten years and each plant can produce over 10,000 seeds with … Continue reading

Posted in Noxious Weeds, Wildflowers | Tagged , | 5 Comments