Giant Hogweed has no positive effects except for the fact that it is a good looking plant. It should be disposed of properly before injury occurs.

Giant Hogweed is very dangerous, if skin comes in contact with this plant it will cause a burn if the skin sees the sun. These burns will scar and need immediate treatment at a hospital. The following images are burns from Giant Hogweed, as you can see they are very severe.

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Picture from Deveron.org.

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Picture from Invasveplantsmi.org.