Morningglories (Ipomoea spp.) are problematic weeds in soybean fields under upland-paddy rotation in Chubu region, Japan. This study monitored the emergence of morningglories and their growth in this setting. Morrningglories emerged following paddy rice rotation, originating from soybean cultivation in the year prior to rice rotation. A lot of them emerged when paddy rice was harvested in late August to early September but very few of them emerged when paddy rice was harvested in late September to early October. The following were noted: I. hederacea Jacq., I. hederacea var. integriuscula A Gray, I. lacunosa L., I. triloba L. and I. coccinea L. The emergence depth of I. coccinea was 0.5 cm in stubble field soil, much shallower than in soybean fields. I. hederacea, I. hederacea var. integriuscula, I. lacunosa and I. triloba emerged in mid-September in the two paddy rice stubbles where paddy rice was harvested in September 4, 2010. They had already started flowering at the plant height of around 15 cm and produced both immature and mature seeds except I. triloba. These data indicate that flooding associated with the single season paddy rice cultivation can not completely kill residual seeds of morningglories in the soil.