Abstract
Due to the global warming, Seoul in Korea seems to be plausible to grow evergreen broad-leaved trees over the cold winter. This offers the planting options to create green environment. Thus, it became worth investigating what kinds of evergreen broad-leaved plants could stand in Seoul during the winter. Ivy (Hedera helix) has been chosen in the current study which is a well-known native and ornamental plant in Europe. It grows in warm condition in general. The current study tracked H. helix which is evergreen cover plant over winter in order to evaluate the possibility for utilizing this species as a climber or cover-plant in Seoul. We found that H. helix can survive over the winter and can be utilized to create evergreen environment in Seoul. It also implies that similar kinds of plants could be tested assuming the environment of Seoul is becoming more suitable for the plants originated from the warmer sites. H. helix is an option for elaborating outdoor environments in the city that lacks of green color.
Highlights
It is difficult to grow evergreen broad-leaved trees except evergreen spindle (Euonymus spp.) in Seoul, Korea because temperature during winter is very cold
H. helix is planted close to the building so that it can climb on the wall
Evaluations of the growth conditions of H. helix in four locations in Seoul on February and on June with naked-eyes showed that plant at each site had green leaves without damages over the winter, which is very promising result for introducing H. helix in Seoul (Figure 1)
Summary
It is difficult to grow evergreen broad-leaved trees except evergreen spindle (Euonymus spp.) in Seoul, Korea because temperature during winter is very cold. Growing of the evergreens may be possible in near future due to the drastically changing climates, so-called global warming which is a worldwide phenomenon(temperature in Seoul in January changed from -7.2 °C in 2011 to -2.8 °C in 2012 and -1.8 °C in 2017 (http://sts.kma.go.kr) (HANSEN and HOUGHTON, 1998; HUGHES, 2000; ROOT et al, 2003) This means that the trees unhabituated from southern than Seoul could be planted in Seoul. This plant is native to Europe and the southwestern part of Asia and belongs to the Araliaceae family (HAUSEN and VIELUF, 1997) It is a perennial woody vine or climber, an herb, a woody subshrub, or rarely a tree which is variable in life form (GRIME et al, 1998; METCALFE, 2005). It grows well in warm condition in general as an indicator of warm conditions (ELLENBERG, 1998)
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