Temperature.
A sudden change in climate and temperature may cause plant damage due to disability in adjusting to the temperature promptly. However, this has become a minor concern in Malaysia compared to the four season countries. During the drought season, it is urged to ensure sufficient water supply is running though the green wall watering system without failure while during the monsoon season, it should be ensured that there is periodic slowing down or stop of watering system to guarantee the planting material is not over moisturized which may spoil the planting material. During night time, a typical tropical climate in Malaysia posts no threat in sudden drop of temperature, hence imposing less concern in this particular [18].