Question: what is the difference between cow parsnip and giant hogweed?
Answer: The stems provide a visual difference. The Cow Parsnip's stem, green and ridged with fine white hairs. The Hogweed stem, green with purple / reddish splotches and coarse white hairs. ... The Hogweed flower cluster may consist up to 50 rays, the Parsnip up to 30 rays.