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A noxious weed, harmful weed or injurious weed is a weed that has been designated by an agricultural or other governing authority as a plant that is harmful to agricultural or horticultural crops, natural habitats or ecosystems, or humans or livestock. Most noxious weeds have been introduced into an ecosystem by ignorance, mismanagement, or ...
You might even face a fine if you knowingly allow these plants to flourish on your property. We explain how to identify and eradicate them.
Solanum elaeagnifolium, the silverleaf nightshade [1] or silver-leaved nightshade, is a species of plant in the nightshade family native to North and South America. It is common in parts of southwestern USA, and sometimes weed of western North America.
Tall waterhemp is a summer annual that produces a large number [quantify] of very small [quantify] seeds. It is considered an r-strategist. Emergence can span several months and often occurs later in the season than other annual weeds, allowing the weed to evade typical weed control strategies such as herbicide application and tillage. [8]
It is best known as a widespread weed and pest plant. It is native to the tropical Americas including Mexico, [1] but it has been introduced to tropical, subtropical, and mild temperate regions worldwide. It is listed as a noxious weed in the United States and has pest status in nine states. [3]
[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.
Goatsrue, a federally listed noxious weed and toxic to humans and animals if ingested, has been identified in Whatcom County. Standing 4 feet to 6 feet tall with white or purple pea-like flowers ...
The roots of most broadleaf weeds are fibrous in nature. The roots can be thin, a large taproot, or a combination. Many broadleaf weeds spread through their seeds and rhizomes, although some only spread through seeds. [2] Popular broadleaf weeds are chickweed, clover, dandelion, wild geranium, ivy, milkweed, plantain (broadleaf), and thistle. [4]