Question: what is the difference between giant hogweed and cow parsley?
Answer: Cow Parsley can grow to just over 1m (3-4 ft), Common Hogweed a bit taller, but Giant Hogweed grows up to 3m (almost 12 ft) and its umbels of flowers are pure white and can reach the size of 60cm (2 ft) across. Giant Hogweed will generally tower over you and its stems are far thicker.