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Preemergent herbicides are a form of chemical weed control which prevent germinated weed seedlings from becoming established. In some areas of the world, they are used to prevent crabgrass from appearing in lawns. [1] Preemergent herbicides are applied to lawns in the spring and autumn, to prevent the establishment of weed seeds. They will not ...
Seadwarf' is a bright green type that is more resistant to a grass disease called dollar spot than other cultivars. [6] There are other uses for the grass, including erosion control in sandy coastal areas, its native habitat. It can be used in phytoremediation when the soils are high in heavy metals. [5]
Veratrum californicum (California corn lily, white or California false hellebore) is an extremely poisonous plant [1] native to western North America, including the Sierra Nevada and Rocky Mountains, as far north as Washington and as far south as Durango; depending on latitude, it grows from near sea level to as high as 11,000 feet.
The plant can be found growing in hedges and waste places, limestone scree and as a garden weed. [21] [22] G. aparine prefers moist soils and can exist in areas with poor drainage. It reportedly flourishes in heavy soils with above-average nitrogen and phosphorus content, and prefers soils with a pH value between 5.5 and 8.0.
It is believed to have originated in Central America, but today has a pantropical distribution and is considered a weed in some areas. [4] In northern Australia, Sida acuta is considered an invasive species, and the beetle Calligrapha pantherina has been introduced as a biological control agent in an attempt to control the plant. [5]
The leaves are grooved (canaliculate), smooth and linear with a white to light green linear midrib on the upper surface, and grow up to 30 centimetres (12 in) long and 8 mm (1 ⁄ 4 in) broad. [ 4 ] O. umbellatum is scapose , with a glabrous flower stem ( scape ) that emerges from the leaf tufts later and is about 10–30 cm (4–12 in) in ...
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