Showing posts with label IBERIAN KNAPWEED (Centaurea pullata). Show all posts
Showing posts with label IBERIAN KNAPWEED (Centaurea pullata). Show all posts
Monday, 8 February 2021
Monday, 11 March 2019
11-3-2019 VAL D'EBO, VALENCIA - IBERIAN KNAPWEED (Centaurea pullata)
Iberian knapweed, also known as Iberian starthistle (Centaurea iberica), is a flowering plant known primarily as a noxious and invasive weed in many parts of the world, despite being native to southeastern Europe and southwestern Asia.
Key Facts
Appearance: The plant is an annual, biennial, or short-lived perennial that grows up to 6 feet (1.8 m) tall with highly branched stems.
Flowers: Flower heads are typically white, pink, or purple and resemble thistles.
Spines: A key characteristic is the "star" of stout, sharp spines (1–3 cm long) that surround the base of each flower head, which makes the plant unpalatable to grazing animals.
Leaves/Stems: Stems and leaves are covered with fine, white hairs. The lower leaves are deeply lobed, while the upper leaves are smaller and more linear.
Habitat: It grows well in disturbed, open areas like fields, roadsides, and rangelands. It is drought-tolerant and can grow in a variety of soil types, including nutritionally poor or dry soils.
Reproduction: It reproduces prolifically by seed, with seeds dispersed by wind, animals, or human activity (e.g., in hay or on equipment).
Invasive Impact: In areas where it has been introduced (such as parts of the United States, Argentina, and Australia), it is considered a noxious weed. It forms dense, impenetrable stands that displace valuable native forage, reduce land value, and discourage wildlife movement.
Status as a Noxious Weed
Iberian knapweed is listed on prohibited or noxious weed lists in several regions, including:
United States: It is a Class A noxious weed in California and Oregon, and a prohibited noxious weed in Arizona, Nevada, and Wyoming.
Canada: It is a prohibited noxious weed seed in the Canadian Weed Seeds Order.
Other Countries: It is on prohibited weed lists in Chile and Australia.
Control efforts in North America have focused on early detection and rapid response (EDRR) to prevent its establishment and spread.
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