Giant ragweed is a problem weed in Wisconsin because of its early emergence, rapid growth, and highly competitive nature. Some previous research might suggest that giant ragweed should not be a long-term problem for the following reasons. Giant ragweed often produces less than 5,000 seeds per plant compared to other weeds that can produce 10,000 to 100,000 seeds per plant or more. Furthermore, studies have found that 35 to 86% of the seed produced by giant ragweed is damaged by insects or is not viable even before it is shed from the plant. Other research suggests that up to 90% of the giant ragweed seed will not survive in the soil past one year. Considering all these facts, it would appear that giant ragweed should not be a persistent weed problem. However, we know it is not easy to quickly reduce giant ragweed populations.