Miniature roses are true roses that have been selectively bred to stay small in size. Most miniatures also have smaller flowers than standard rose bushes, but they come in the same variety of types and colors. Despite their small size, miniature roses are extremely hardy. In fact, they are more winter hardy than most tea roses, and they also tend to be profuse repeat bloomers.The genetic parentage of miniature roses can be difficult to define since they have been in cultivation since the 17th century, but most originated as genetic mutations of Old Garden Roses (Rosa gallica and Rosa centifolia), or China roses (Rosa chinensis). Most types now grown are the result of extensive breeding and are long divorced from the original native species.