Root-grafting is practicable with many plants, either on their own roots or on those of others, and a larger stock is obtainable of such as succeed than by any other method. Good roots should be secured as stocks when the plants bearing them are in a dormant state, and the grafts inserted, in most cases, when the sap begins to flow in spring. Large fleshy roots, such as Dahlias and Tree Paeonies, should have a notch cut in a triangular form, about 1 1/2in. long, and the shoot or graft similarly prepared and made to fit therein Other plants largely propagated by Root-grafting are Bignonias, Clematis, Hollyhocks, and Wistarias. Saddle-grafting on roots is sometimes employed.