A blank for manufacturing therefrom, by folding, a fixing assembly for fixing a pot or container in an outer box for shipment of a plant or a number of cut flowers received in the pot or container, wherein the blank comprises: - a central blank part having a rectangular configuration with a first and a second longitudinal edge (14, 14') which are located opposite each other and have a defined longitudinal edge length and with a first and a second transverse edge (16, 16') which are located opposite each other and have a defined transverse edge length; - a recess provided in the central blank part, in which the pot or container is receivable; - a first fixing flap, with at least a central part of the first longitudinal edge being a folding line which connects the first fixing flap with the central blank part; and - a second fixing flap, with at least a central part of the second longitudinal edge being a folding line which connects the second fixing flap with the central blank part; - a first tube flap assembly (18, 20, 22), which comprises at least three tube flap parts including a connecting flap, one or more intermediate flaps and an end flap which are successively connected by folding lines which extend parallel to said transverse edges (16, 16'), with the first transverse edge being a folding line which connects the connecting flap with the central blank part, and with a free edge of the end flap remote from the central blank part forming a clamping edge for clamping the container or pot between this clamping edge and the central blank part in set-up condition of the fixing assembly; - a second tube flap assembly (18', 20', 22'), which comprises at least three tube flap parts including a connecting flap, one or more intermediate flaps and an end flap which are successively connected by folding lines which extend parallel to said transverse edges (16, 16'), with the second transverse edge being a folding line which connects the connecting flap with the central blank part, and with a free edge of the end flap remote from the central blank part forming a clamping edge for clamping the container or pot between this clamping edge and the central blank part in set-up condition of the fixing assembly. - a central blank part having a rectangular configuration with a first and a second longitudinal edge (14, 14') which are located opposite each other and have a defined longitudinal edge length and with a first and a second transverse edge (16, 16') which are located opposite each other and have a defined transverse edge length; - a recess provided in the central blank part, in which the pot or container is receivable; - a first fixing flap, with at least a central part of the first longitudinal edge being a folding line which connects the first fixing flap with the central blank part; and - a second fixing flap, with at least a central part of the second longitudinal edge being a folding line which connects the second fixing flap with the central blank part; - a first tube flap assembly (18, 20, 22), which comprises at least three tube flap parts including a connecting flap, one or more intermediate flaps and an end flap which are successively connected by folding lines which extend parallel to said transverse edges (16, 16'), with the first transverse edge being a folding line which connects the connecting flap with the central blank part, and with a free edge of the end flap remote from the central blank part forming a clamping edge for clamping the container or pot between this clamping edge and the central blank part in set-up condition of the fixing assembly; - a second tube flap assembly (18', 20', 22'), which comprises at least three tube flap parts including a connecting flap, one or more intermediate flaps and an end flap which are successively connected by folding lines which extend parallel to said transverse edges (16, 16'), with the second transverse edge being a folding line which connects the connecting flap with the central blank part, and with a free edge of the end flap remote from the central blank part forming a clamping edge for clamping the container or pot between this clamping edge and the central blank part in set-up condition of the fixing assembly.