As with many members of the Asteraceae family, it starts life as a rosette, and then bolts to form an upright flower stem. Sow thistle is an annual weed that can establish at any time of the year. It ...

Canada thistle (Cirsium arvense) is an aggressive, invasive plant. Here's how it spreads and how to identify it so it doesn't ...

Our Mystery Plant ("Spiny sow-thistle”, Sonchus asper ... Sure enough, it is common all over the USA as a weed, and not just in gardens. John Nelson is a retired botanist from the herbarium ...

Residual herbicides remain active in the soil for several months, killing weed seeds as they germinate. As the creeping root system of Californian thistle is deeper in the soil than the residual ...

Plant Cover Crops To Eliminate Space For Weeds To Take Root When it comes to thistle weeds, bare spaces within your yard are ...

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Not all invasive weeds announce themselves with rough ... They spread via seeds and stray plant parts. Since musk thistle (Carduus nutans) can produce over 20,000 straw-colored seeds singularly ...