Botany · Horticulture and Landscaping
A landscape designer is comparing vertical gardens to conventional ground beds for improving a microclimate in a narrow courtyard with high surrounding walls. Considering surface area exposure, shading effect, air movement, and evapotranspiration, which explanation best justifies why a properly irrigated vertical garden can significantly reduce perceived temperature for users of the space during daytime?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1Vertical gardens have no effect on heat exchange, as plants in vertical systems do not transpire and only add decorative value.
- 2The vertical garden increases heat reflection, raising air temperature and reducing comfort for people walking near the wall.
- 3The large vegetated vertical surface provides shading, reduces direct solar radiation on the wall, and enhances evapotranspiration, which cools the surrounding air and lowers radiant temperature.✓
- 4Vertical gardens only insulate at night and increase daytime heat storage, thus they are installed mainly for nocturnal cooling in open courtyards.
Correct answer
The large vegetated vertical surface provides shading, reduces direct solar radiation on the wall, and enhances evapotranspiration, which cools the surrounding air and lowers radiant temperature.
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