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The differences in broadleaf weeds' structure and growth habits make them easy to distinguish from narrow-leaved weedy grasses. [5] Most broadleaf weeds have leaves with net-like veins and nodes that contain one or more leaves, and they may have showy flowers, [6] while grassy weeds appear as a single leaf from a germinated seed. [7]
Tussock paspalum (P. quadrifarium) is considered a noxious weed in Australia. [13] The term “paspalum” without qualification in Australia refers to the common lawn weed P. dilatatum. [14] Australia has five native [a] and approximately sixteen naturalised species. [15]
It is a common weed of cultivation, known in the Americas as annual bluegrass. [7] It occurs as a common constituent of lawns , where it is also often treated as a weed, and grows on waste ground. Many golf putting greens , including the Oakmont Country Club greens, are annual bluegrass, [ 8 ] although many courses have converted to creeping ...
They are annual plants, and one plant is capable of producing 150,000 seeds per season. The seeds germinate in the late spring and early summer and outcompete the domesticated lawn grasses, expanding outward in a circle up to 30 cm (12 in) in diameter. In the autumn when the plants die, they leave large voids in the lawn.
[2] [3] [4] It is considered to be one of the ten worst weeds in the world. [5] In the United States, Johnson grass is listed as either a noxious or quarantined weed in 19 states. [ 6 ] With Sorghum bicolor it is a parent of Sorghum × almum , a forage crop also considered a weed in places.
Because Euphorbia maculata grows quickly in a variety of climates it is seen as a weed throughout much of North America and can be a particularly troublesome weed in crop fields and pastures. The growth of E. maculata in agricultural fields may impact crops yields such as vegetables, legumes, and cereals.
It is a weed of lawns [3] and turf. [4] This grass is a perennial with erect or prostrate stems that can exceed one meter in length. The flat leaf blades are hairless to slightly hairy. They vary in color. The panicle has up to 6 branches up to 17 centimeters long lined with small oval to rounded spikelets.
The grass is medium to light green in color and has a coarse texture with short upright seedhead stems that grow to about 3-5 inches. Native to Southern China, it was introduced to the United States in 1916 [1] and has since become one of the common grasses in the Southeastern United States and Hawaii.
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