This paper deals vvith the experiment of propergation by cutting, the method of breaking the hardness of seed coats, and the problem of inducing polyploids by colchicine on Kudzu, Pueraria hirsuta Matsum.
( 1 ) The test of monthly planting of cuttings with the yearling vines showed the difficulty in root development of cuttings. Especially in mid-summer rotting of cuttings took place abundantly, and planting in early autumn was rather better.
( 2 ) Effective measure of breaking hardness was shown in the treatment of soaking seeds in 98 % sulfuric acid. The high percentage of 89 was gained by the treatment of I hour.
( 3 ) In the experiments of soaking seeds in colchicine solution for inducing polyploids, the concentration of solution above 0.1 % showed the decrease of germination and withering of germs. The treatments of 0.004 % solution in 24 hours under 25℃ and of 0.02 % in 18 hours under 10 ℃ were effective to induce polyploids.