It thrives in cool, moist conditions. Blue vervain is a tall, perennial weed with slender spikes of small, blue to purple ...

Spring often brings a welcome burst of color to our gardens, but it can also introduce a wave of invasive weeds in your flower beds and lawns. Among these common invaders, a few weeds like henbit ...

and other crops are often covered with small purple flowers called Striga. These eye-catching flowers are known as ‘witch weeds,’ as they survive and spread by parasitizing the roots of other ...