Guiding principle on the formation and management of Platvcodon grandiflorum A. DC. population in the recreational forest

Abstract

In order to develop an attractive floorscape by the introduction of Platvcodon grandiflorum A. DC., one of native perennial plants with beautiful purple-colored flowers, in the recreational forest, those plants were experimentally planted in Qrcrcus serrata stands at Miki City, Hyogo Prefecture from 1982 to 1985.
Results were as follows. Under about 50% relative light intensity on the forest floor, P. grandiflorum satisfactorily flowered and seeded. In this light condition, P. grandiflorum grew vigorously irrespective of topography. In order to regulate commpetitive plants, at least, brush cutting once a year at the end of July was required. Natural flowering term of P. grandiflorum is from the end of June to the end of July. But plants which cut in July, had the second flowering term from the end of September to the end of October. Fertilizing and watering were not required for growth of P. grandiflorum. But pesticide spray was necessary to control aphides.