Plum tree named ‘Suplumfiftythree’

A new and distinct plum tree variety, Prunus salicina , cv. ‘Suplumfiftythree’ is characterized by having large, juicy fruit with black skin and red flesh. The fruit of the new variety ‘Suplumfiftythree’ also has a high Brix:Acid ratio, firm flesh, a mild sweet flavor and a stone that clings to the flesh. The date of ripening of the fruit of the new variety is later than for ‘Black Splendor’ (unpatented) and earlier than ‘Owen-T’ (unpatented). The fruit of the new variety ‘Suplumfiftythree’ is larger than the fruit of ‘Black Splendor’ and smaller than the fruit of ‘Owen-T’.