Double Rootstock Grafting . A scion, the flowering and/or fruiting part of the plant, is grafted onto rootstock for a variety of reasons. The experiment was conducted in girirejo, ngawi,. Grafted Tomato Plants Banner Greenhouses from www.bannergreenhouses.com Grafting or graftage is a horticultural technique whereby tissues from one plant are inserted into those of another so that the two sets of vascular tissues may join together. • growth and development is accelerated or double in comparison with single rootstock. The scion and rootstock must be of closely related plant species in order for the graft to work.