造園樹木の冬季挿木に関する研究

Abstract

The exeriments were carried out to clarify the effects of the cuttings of garden trees and shrubs in winter. The six evergreen trees and shrubs (Taxus cuspidata var. nana, Juniperus chinensis var. Kaizuka, Raphiolepsis umbellata var. minor, Ilex crenata var. convexa, Camellia japonica var. hortensis, and Rhododendron omurasaki), were used as materials.In winter, their cuttings were placed in a coldframe (control), and in hotbeds in open air (hotbed plot) and inside a plastic house (plastic house plot). The variation of weight of the cuttings, the numbers of the cuttings which took root, and their growth, were investigated. On the other hand, they were compared with summer cuttings.The winter cuttings of these plants were successful, when they were placed in a hotbed inside a plastic house, except Suniperus chinensis var. Kaizuka. This way of winter cutting is enough practical.