Effect of soil temperature on the growth of Japanese white oak under the conditions of low light intensities was investigated. Trees were grown in an environment controlled chamber for 11 months at soil temperature of 8°C, 12°C, 25°C and 33°C. Soil temperature of 8°C, 12°C and 33°C was controlled by a soil temperature control system. Soil temperature of 25°C was uncontrolled. The number of leaves, area of leaves, tree height, and trunk diameter were affected by the soil temperature. Low soil temperature suppressed the enlargement of leaves under the low light intensity conditions. These results suggested the possibility of growth control of indoor plants by adjusting the soil temperature.