If left to their own devices, they will eventually grow into tall ... sometimes called spear thistle, Fuller's thistle, and lance-leafed thistle, is a biennial weed found in almost every state ...

Hence the move to make similar use of this closely related and much more common species. As sow thistle can grow up to 1 m tall, it can be quite a competitive weed. It gets its common name from being ...

Blue vervain is a tall, perennial weed with slender spikes of small ... A perennial with spiny leaves and small, purple, ...

This aggressive weed is difficult to control ... The flowering period is from late june until frost in the fall. Musk thistle is biennial or sometimes a winter annual, which grows up to 6 feet tall.