For the colder parts of the Great Plains and as far east as to include Wisconsin, Americana seedlings are the only stocks that will withstand the winter. In this region Americana stocks are, of course, used only for the native plums and data seem to be lacking as to whether other plums cultivated for their fruit could be grown on this stock or not. The W. & T. Smith Company of Geneva report that they are now using Americana seedlings for native plums for their eastern trade, speaking of them as follows: “We think we get a larger growth and a better root system by using the native (Americana) stocks. We also consider that the Flowering Almonds, _Prunus triloba_ and _Prunus pissardi_, make a better growth on native stocks.” From the last statement one would suspect that it would be feasible to grow other orchard plums than the native species on this stock. As yet Americana seedlings are expensive, and until they cost less their use in competition with the Myrobalan and peach stocks will be almost precluded. The chief fault of the Americana stock is that the trees sucker rather badly. Besides the plants discussed above various nondescript members of the genus Prunus are used as stocks for cultivated plums under particular circumstances or for particular purposes. Seedlings of Munsoniana plums are supposed to be preeminently adapted for low wet lands. J. W. Kerr believes that seedlings of _Prunus hortulana_ are excellent stocks for native plums as they never sucker.[152] The Sand plum (_Prunus angustifolia watsoni_) offers possibilities as a stock for dwarfing larger growing species. According to Hansen,[153] who reviews the literature and describes several experiments of his own, the western Sand cherry (_Prunus besseyi_) dwarfs varieties worked upon it and has the merits of being extremely hardy and of producing trees which bear early and abundantly. As stated in the discussion of Subcordata, stocks of this plum have been used on the Pacific Coast and discarded because it dwarfs trees and suckers badly. According to Wickson,[154] the apricot and almond are sometimes used as stocks for plums in California and in some instances with considerable success.