Abstract
Spiranthes sinensis is one of the useful living plant materials for the creation of semi-natural park landscape. To establish the methods of in-situ conservation of S. sinensis in the grassland, both the characteristics of applicable grassland vegetations and the life history of S. sinensis were investigated during the period from 2004 to 2005 at SHOWA KINEN PARK. It is recognized that the mowing frequency and the disposal of mown plant materials, whether they are eliminated or not, greatly influence the floristic composition of grassland plants. The following two points are important to succeed the in-situ conservation of S. sinensis. 1) The dominance of grass type weeds that possesses the higher penetration rate of irradiance around the individuals of S. sinensis during its vegetative stage. 2) The elimination of mown plant materials.
