Own root roses are cuttings that are grown on their own roots. This makes them virus free (rose Mosaic virus), and you will never have rootstock “suckers” to cut back, plus they will never convert to root stock if they freeze down to the ground in very cold climates. This makes winter-kill much more unlikely. Once established in the garden they are much hardier then their grafted counterparts, and have an increase in vigorous growth and bloom, and a much longer life expectancy than grafted roses. It will never outgrow the bud union, or need to be replaced after a number of years. By the third year, the own root rose will be just as big as a grafted rose of the same age, but will have a more uniform shape (as it does not have a bud union to inhibit growth) and bloom more, and be more winter hardy.