Abstract
We planted the near-threatened species Pecteilis radiata in an approximately 2,800 m2 area of a swamp on the campus of Gifu Women's University and observed the plants for 12 years. In 2001, we divided the swamp into 16 plots and planted the bulbs at selected locations in each plot. However, over the next 3 years, the plants in half the plots died. In 2004, we replanted the bulbs in the areas where the plants died. The water level at the planting locations may have affected plant growth, as growth rates were lower at deep-water locations. When the bulbs were planted with bog mosses, they were stabilized and the germination rate improved. Four plots planted in 2001 and five plots replanted in 2004 survived until 2012. The number of plants at the most prolific plot in 2010 was 64 times that in 2001.
