Scores of prized horticultural plants brought to North America from other continents have jumped the garden gate and escaped into the natural landscape. These invasive weeds are driving out indigenous species, and in the worst cases are radically altering native ecosystems. Scientists consider them one of the top three threats to the biodiversity of wildlands. This ground-breaking guide helps you identify the worst invasives in your area - and tells you what to do about them to help preserve the native plants and animals that are disappearing from our land and lives.