The most notoriously invasive and hazardous species is Heracleum mantegazzianum. This species is native to the Caucasus region but was introduced to the US as an ornamental plant. Giant hogweed is much larger and taller than the other Heracleum species, growing to be 12-15 feet tall and 3 feet wide.

Is common hogweed dangerous?

Although common hogweed is less dangerous than giant hogweed, care should be taken when handling the plant, as skin irritation can occur.

Which hogweed is poisonous?

Giant hogweed - Heracleum mantegazzianum - is an infamously dangerous plant which you will probably come across if you walk besides rivers and streams or near a fresh water source.