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 ...

Yet one by one, like wolves in the night, tumbleweeds start ... Plants Database lists Russian thistle growing in every state except Florida and Alaska. The weed has also continued to thrive ...

Scotch thistle is the most common thistle species in New Zealand with spines on both the leaf surface and margins. Scotch thistle is a biennial weed, so it depends quite heavily on the establishment ...