동철기 옥상정원의 식물관리 양상을 알아보기 위하여, 서울시에서 지원한 18개소의 옥상정원을 대상으로 식물관리 실태를 현지 조사 및 정원관리 담당자와의 면접설문을 통해 조사 분석한 결과 동철기 옥상정원관리에서 식물관리(33.3%), 냉해(22.2%), 물 관리(11.1%, 시설관리(11.1 %) 외에도 홍절기 병충해(5.6%) 방생으로 식물관리에 어려움이 많은 것으로 나타났다. 옥상정원에서 동절기에 관상이 가능한 식물은 상록수의 Pinus densiflora(반송), Taxus cuspidata(주목), 낙엽수에서는 Coruns alba(말채), 초화류는 Pachysandra tennímllís(수호초)가 가장 많았으나 관상 가능한 식물이 1~3종으로서 종류가 매우 빈약한 것으로 나타났으며 특히 동절기 상록수에 대한 정기적인 물 관리의 중요성 인식이 필요한 것으로 연구되었다.
This study was performed to examine plant maintenance condition in roof gardens during winter season. The subjects in this study were 18 roof gardens that Seoul city supported. We carried out an on-site investigation of each roof garden and did a survey targeting the roof garden managers. The results are as follows. It was shown that the roof garden managers had difficulty in managing the garden during winter season for several reasons, 33.3% for plant maintenance, 22.2% for chilling injury, 11.1% for water management and 5.6% for disease and pest. The plants that could be ornamental in roof gardens during winter were Pinus denisflora Siebold et Zuccarini for multicaulis and Taxus cuspidata Siebold et Zuccarini that were evergreen trees, Coruns alba that were deciduous trees and Pachysandra terminalis Sieb. et Zucc. that were herbaceous ornamental. In fact, the number of species that could be ornamental plants were very poor, which were 1 to 3 in each category. The study gave us the lesson that we need to realize the importance of periodical water management, especially for evergreens.