Perennial plants are plants whose biological cycle takes place over several calendar years. They bloom every year, some of them form fruits and seeds every year. Their main characteristic is the dormancy period, the period during which the aerial vegetative organs die, and the survival of the plant and the vegetative growth in the following season is achieved through the buds found on the underground vegetative organs.
Vertical gardens, such as green walls, represent solutions for overpopulated, polluted urban areas, where the density of built elements does not allow the set up of horizontal green spaces.
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