The altitude of Taiwan's terrain varies greatly, resulting in different climates and environments that have, in turn, led to an abundance of different plant life. However, due to the needs and preferences of humans, and perhaps by accident via various modes of transportation, seeds and live specimens of invasive plants have been introduced into the environment. After adapting to the local environment, there is the chance that these invasive species may become naturalized and spread. Some of these plants include the oxeye daisies （Leucanthemum vulgare H. J. Lam） in Batongguan of Mt. Yu in the middle of Taiwan, the garden cosmos （Cosmos bipinnatus Cavanilles） and foxgloves （Digitalis purpurea Linn.） at middle-high altitude areas, the Gaillardia pluchella Foug in Penghu, etc. In extreme cases, these invasive species are invasive and adversely affect native species. Such was the case with the mile-a-minute weeds （Mikania micrantha H. B. K.） in Central and Southern Taiwan and the spread of Bidnes pilosa var. radiata throughout the island.

The rich plant diversity of Yangmingshan National Park depends on the efforts of every single person. In recent years the park has been invaded by invasive grass and ornamental plants. For example, the Bidnes pilosa var. radiata, which flowers profusely and has a high setting percentage with seeds spreading by clinging to human clothing and animal fur. The plants grow in open areas of land with plenty of sunshine. The park has promptly removed such plants to ensure they do not reproduce and disrupt the local habitat. The second species is the spiderwort （Tradescantia fluminensis Vell.）, which grows on damp slopes and creeps slowly outward, smothering and crowding out native plants. The park removes spiderwort populations regularly to reduce their rate of spreading. Another type of common garden plant is called Impatiens walleriana （also known as touch-me-not）, which comes from Africa and is popular in horticultural circles because of its brightly-colored petals and ease of planting. However, Impatiens walleriana also has a high setting percentage with seeds that disperse via explosive dehiscence. It prefers wet and shady places and is often found in the shade of the park's forests and near streams and ditches. The park headquarters ask that all visitors and local residents not plant any of these invasive plants in order to preserve the area's natural habitat and ecosystem.