Abstract: A block is made of a hydrophilic or hydrophobic plastic foam body (1) into which natural flowers, branches, twigs, fruit or the like can be stuck and held. The plastic foam body (1) is provided with a water-tight casing (2) made of plastics or lacquers. A water storage space (3) connected with the outside through a filling pipe (4) is provided in the bottom area of the block between the casing (2) and the plastic foam body (1).