Are roses an invasive species

Answer 1

It depends on the rose and the area of the world.
According to Wikipedia: In eastern North America, Rosa multiflora is now generally considered an invasive species, though it was originally introduced from Asia as a soil conservation measure, as a natural hedge to border grazing land, and to attract wildlife.
It is readily distinguished from American native roses by its large inflorescences, which bear multiple flowers and hips, often more than a dozen, while the American species bear only one or a few on a branch.
Some places classify Rosa multiflora as a "noxious weed". In grazing areas, this rose is generally considered to be a serious pest, though it is considered excellent fodder for goats.