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Numerous plants have been introduced to the US state of New Jersey in the last four hundred years, and many of them have become invasive species that compete with the native plants and suppress their growth. Duke Farms identified 55 invasive species on its property and investigates methods to control them. Major invaders are: [1]
Verbesina virginica, known by the common names white crownbeard, [1] or frostweed [2] is a species of flowering plant in the family Asteraceae. It is native to the Southeastern United States, where it is found in calcareous soil, often in bottomland thickets and edges of woods. [3] It is a tall perennial species. It produces heads of white ...
Ageratum (/ ə ˈ dʒ ɛr ə t ə m /) [2] (whiteweed in the US) is a genus of 40 [3] to 60 tropical and warm temperate flowering annuals and perennials from the family Asteraceae, tribe Eupatorieae. Most species are native to Central America and Mexico but four are native to the United States.
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Typically, its stems are branched and the clump forming plants emerge in late spring after most other plants have begun growth for the year. The oppositely arranged leaves are 7.5 to 15 cm (3 to 6 in) long and 1 to 4 cm ( 1 ⁄ 2 to 1 + 1 ⁄ 2 in) wide and are narrow and lance-shaped , with the ends tapering to a sharp point.
The flowers are borne on a stem that arises from a bulb, generally in the spring or early summer. Flowers can be white, yellow, pink, purple, bluish, or streaked. The insides of the petals are often very 'hairy'. These hairs, along with the nectaries, are often used in distinguishing species from each other. [5] Species [2] [10] [11] [12] [13]
A giant hogweed plant usually produces a flowering stalk in 3–5 years, [2] [14] but plants may take up to eight years to flower if conditions are unfavourable. In the Czech Republic, a single plant reached twelve years old before flowering. [15] In any case, when the plant finally flowers, it does so between June and July (in the northern ...