These plants are V-shaped. Cane growth is angled instead of vertical. suckering . . . This is similar to the dense form except that suckering can occur. Many Gallica cultivars exhibit this form. Unless controlled, suckering can increase plant width.
Some cultivars sucker so vigorously that invasiveness is a problem.
Plant Width A rose plant s width is most often affected by a cultivar s ability to sucker. Suckering is common among Old Garden Roses and Species Roses. Most rose cultivars are propagated by budding. Because the bud union is susceptible to winter injury, plants in northern climates should be planted with the bud union 2 to 4 inches below ground to protect the union from injury. This often results in the formation of roots by the cultivar above the bud union so that plants go own-root over time, and suckering can become a problem.