The giant hogweed (Heracleum mantegazzianum) is a plant that stands out due to its big purple stem. It is an invasive species native to the Caucasus region of Eurasia, but has spread throughout Europe and North America in recent decades. The stems can grow up to 5m tall and are hollow with grooved ridges along their length, which are covered in coarse hairs. These stems make it easy for the plant to be identified from other plants, as they have very few similar features. The large leaves of the hogweed are also distinctive; they can reach up to 1m wide and have smooth margins or serrated edges depending on how old they are when cut. Furthermore, this dangerous weed produces white flowers which form umbrella-like clusters at the top of each stem during late spring and early summer months - these blossoms attract bees which help pollinate them so that more seeds can be produced!