Multiflora Rose
Ley Om

After all of the effort gardeners spend trying to get finicky roses to bloom and shrug off pests and diseases, an aggressive grower like Rosa multiflora seems almost welcome. However, this Asian import, which arrived in the United States in 1866 as a root stock for ornamental roses, can now be found in large thickets in all types of habitats, from wetlands to prairies. These dense growths exclude all kinds of native plants, and disrupt the ecosystem by denying birds a place to nest. A single plant can produce one million seeds, which can retain the ability to sprout for 20 years.

If you're looking for a hardy, low maintenance rose, plant a rose from the 'Knock Out,' 'Drift,' or 'Carefree' series. These will bloom all season with little more than an annual pruning.