The invention provides a panel (10) for installation in an external wall (1) of a building, the panel being adapted for growing plants (15) thereon and being sized, shaped and otherwise adapted to fit across an opening in the wall. The panel (10) comprises a rotatable section (12), one or more plant holding attachments (14) and fixings (13, 30, 31, 32a, 32b, 33). The rotatable section (12) comprises a first side (18) and an opposite second side (19). The plant-holding attachments (14) are on at least the first side of the rotatable section (12) and are adapted to hold growing plants (15) or to hold containers for growing plants. The fixings (13, 30, 31, 32a, 32b, 33) movably secure the rotatable section (12) inside the opening, so that the rotatable section (12) can be moved between at least external (2) and internal (3) positions of the first side (18) with the same vertical orientation (20). When the first side (18) is in the external (2) position, it is externally oriented and closes across the opening. When the first side (18) is in the internal (3) position, it is internally oriented, so as to allow plants (15) located in the plant holding attachments (14) on the first side (18) to be tended from inside (3) the building.Linvention concerne un panneau (10) pour linstallation dans une paroi externe (1) dun bâtiment, le panneau étant conçu pour cultiver des plantes (15) sur celui-ci et étant dimensionné, formé et autrement adapté pour sajuster à travers une ouverture dans la paroi. Le panneau (10) comprend une section rotative (12), un ou plusieurs accessoires de support de plante (14) et des fixations (13, 30, 31, 32a, 32b, 33). La section rotative (12) comprend un premier côté (18) et un second côté opposé (19). Les accessoires de support de plante (14) se trouvent sur au moins le premier côté de la section rotative (12) et sont conçus pour supporter la culture de plantes (15) ou supporter des contenants pour cultiver des plantes. Les fixations (13, 30, 31, 32a,
