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Page 5 <br />Urban forests are composed of a mix of native and exotic tree species. Thus, urban forests often have a tree diversity <br />that is higher than surrounding native landscapes. Increased tree diversity can minimize the overall impact or <br />destruction by a species-specific insect or disease, but it can also pose a risk to native plants if some of the exotic <br />species are invasive plants that can potentially out-compete and displace native species. In City of Pleasanton, about <br />43 percent of the trees are species native to North America, while 29 percent are native to California. Species exotic <br />to North America make up 57 percent of the population. Most exotic tree species have an origin from Asia (27 <br />percent of the species).