About Heracleum sosnowskyi Manden.
Heracleum sosnowskyi, also known as Sosnowsky's hogweed, reaches a height of 3–5 metres (10–16+1⁄2 feet). It has a straight, firm stem that can grow up to 12 centimetres (4+1⁄2 inches) in diameter. Its leaves are 50–60 centimetres (20–24 inches) long, and its very firm root can reach up to 30 centimetres (12 inches) in diameter. A large umbel inflorescence forms at the end of every stem. This species blooms from July to September and produces thousands of seeds. Seeds are easily distributed by wind, but are most commonly spread by water. Sosnowsky's hogweed is a monocarpic perennial, meaning the entire plant, including the root, dies after it flowers and produces seed.
