It is often advantageous for the potato breeder or pathologist to obtain a large number of plants from a single potato tuber. A test was run to determine whether a larger number of plants could be obtained from a single potato tuber than by the conventional method of seed cutting. In this test, two groups of four tubers each of Kennebec, Penobscot, Katahdin, and Kasota varieties, weighing approximately 8 ounces each were used. Tubers for the test were harvested in September 1964 at Presque Isle, Maine. They were shipped to Beltsville, Maryland, and placed in storage at 40 F in October. The tubers were removed from storage on February 6, 1965. In one group the tubers were left whole. In the other group each tuber was cut into four pieces. The whole tubers and the cut pieces were then green-sprouted under daylight conditions in the greenhouse (Fig. 1). The temperature in the greenhouse was maintained at 50 to 55 F at night and at 60 to 65 F during the day. After green-sprouting for 6 weeks, the sprouts were removed from the tubers and seed pieces and cut into sections having either a lateral or terminal bud. These were planted in the greenhouse. Plants were counted approximately 1 month later. Fig. 2 shows the 20 plants from 21 buds from a whole tuber of the variety Kasota. Table 1 shows the mean number of buds per tuber and the mean number of plants per tuber obtained from the four varieties in the two treatments. The cut-tuber group yielded a mean of 31.2 plants per tuber. This is significantly greater than the 20.2 plants per tuber yielded by the whole-tuber group. Kennebec and Penobscot produced a significantly greater number of plants than Katahdin and Kasota.