Common brass buttons ,Cotula cornopifolia, are one of the most abundant invasive aquatic plants growing along the California coast. The C. cornopifolia disk resembles a yellow tennis ball with more than fifty flowers present. Over the past couple of years, the dispersal of these invasive plants has almost doubled in size and show no signs of declining growth. The C. cornopifolia prefer salt and freshwater marshes, which explains why they thrive along the coasts of different countries and states. The purpose of this study is to find where the C. cornopifolia are present in California and analyze the contributing explanatory variables that help the plant expand into other areas of California. This study is important because if the C. cornopifoliacontinues to expand it can cause a decline in biodiversity within both the plant and animal populations. If the C. cornopifolia continues its rapid growth pattern, it could cause major environmental change within the state of California and cause devastation to the native plants and animals that reside there.