Green walls are getting more attention, much as green roofs have in recent years. PNC Bank has installed a 2,380 square-foot living wall on their 30-story Pittsburgh headquarters, including more than 14,000 plants. The building’s wall behind the plant structure is 25% cooler than ambient temperatures, which demonstrates a significant savings in energy costs. This is an elaborate green wall but one which requires very little water (15 minutes once each week); vines may be a good low-maintenance option, though the energy savings of a looser-growing plant may be less.
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