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A specimen, 6 in. through at the base, may be seen at Kew, where it has been for many years, without altering perceptibly in size. All the larger-stemmed Mamillarias are exceedingly slow growers after they have reached a certain size, although, in the seedling stage, they grow freely. The treatment for this kind should resemble that advised for the last.
All the larger-stemmed kinds may be kept in health when grown on their own roots; but for some of the smaller species it is a good plan to graft them upon the stem of some of the Cereuses, C. tortuosus or C. colubrinus being recommended for the smaller kinds, and for the larger C. peruvianus, C. gemmatus, or any one the stem of which is robust, and of the right dimensions to bear the species of Echinocactus intended to be grafted.
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