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Study of Vertical Greening Application

Study Objective

  1. To carry out a review based on published literature on selection of climber species and identify suitable species for planting on wall surfaces.
  2. To evaluate the performance of climber species in relation to some key growth parameters, such as aspects, supporting systems, growing medium and horticultural maintenance requirements.
  3. To monitor the cooling effect of green wall using a combination of environmental monitoring equipment.

Major Findings

  1. VG has prominent environmental benefits specially the cooling effect. The research shows that the temperature of exterior green wall could drop by 7°C in the summer with vegetation cover.
  2. VG can bring significant aesthetic and ecological benefits to the surroundings and nearby residents.

Performance of Climber Species

Mesh Mode Characteristic
Greening Effect Growth Rate
Grade Species Name Foliage Density Flower Color Seasonality Inital Grow Rate Fast Growing Species
B

Antigonon Leptopus
珊瑚藤

 U Rose Pink Semi-Deciduous Quick X
B

Bauhinia Corymbosa
首冠藤

 U White Evergreen Medium X
B

Bougainvillea Spp.
九重葛

 E Multi-Color Semi-Deciduous Slow X
A

Lonicera Japonica
金銀花

 E Yellow/
White		 Evergreen Quick X
C

Podranea Ricasoliana
紫雲藤

 E Prinkish Red/
Light Violet		 Evergreen Slow X
C

Pseudocalymma Alliaceum
蒜香藤

 U Purple Flower Evergreen Medium X
C Pyrostegia Venusta
炮仗花		 U Orange-red Semi-Deciduous Medium X
A Quisqualis Indica
使君子		 E White + Pink to Red Semi-Deciduous Quick X
C Vitis Vinifera
葡萄		 L Fruit Deciduous Medium X
A Wisteria Sinensis
紫藤		 E Purple Deciduous Quick X
 
Concrete Mode Charactertistic
C Campsis Grandiflora
凌霄		 E Orange to Red Deciduous Slow  
E Epipremnum Aureum
黃金葛		 E Creamy White or Green Evergreen Slow  
D Ficus Pumila
薜荔		 L Not Visible Evergreen Slow  
B Parthenocissus Dalzielii
異葉爬山虎		 E Yellow Deciduous Quick X
E Philodendron Scandens
圓葉蔓綠絨		 L Green Evergreen Slow  
D Sygonium Podophyllum
合果芋		 L White Evergreen Slow  
E Trachelospermum Jasminoides
絡石		 E White Evergreen Slow  

Remark:

  1. Foliage Density:
    E- Species with even and dense foliage
    L- Species with concentration of foliage at the lower part
    U- Species with concentration of foliage at the upper part
  2. Initial grow rate:
    Quick - Species growth up to reaching 10m or above within 6 months after planting.
    Medium – Species growth between 6m to 8m within 6 months after planting.
    Slow- Species of slow establishment after planting i.e. reaching less than 6m within 6 months after planting.
  3. Fast growing species are defining as reaching the top of tank within  18 months  (i.e. ~13m)
  4. A and B-Grade species are highly recommended.
  5. C- Grade species suffering slow initial growth rate can be used where fast greening effect is not demanded and site condition are less exposed.
  6. D and E- Grade should be used with full understanding of their limitation.
  7. Twenty climber species have been tested, other than those list in the table, three more species i.e. Ficus pumila cv variegate, Hedera helix, Hedera nepalensis var. sinensis have been tested but found dead during the study period and are not recommended for external use.
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