Picture of cylindrical plant wall

Quick answer：

Cylindrical plant walls are vertical gardening structures that utilize a circular or cylindrical shape to grow plants. They are commonly used in urban environments for greenery, aesthetics, and to improve air quality. The design often includes a trellis or frame that supports various plants, which can be vines, shrubs, or small trees. Plant walls can be either self-contained units or integrated into buildings. They can be made from various materials such as wood, metal, or concrete, and may use hydroponic or traditional soil-based systems for irrigation.