Cow parsnip (Heracleum maximum) is in the same family as giant hogweed. It is native to North America and found in almost every area within USDA Zones 4a to 10a. Cow parsnip is sometimes called ...

Giant hogweed is sometimes confused with cow parsnip or poison hemlock, described here, which are two other plants that can also cause adverse reactions from contact: Giant hogweed is an invasive ...