Plum tree named ‘Suplumfiftyfour’

A new and distinct plum tree variety, Prunus salicina , cv. ‘Suplumfiftyfour’ is characterized by having very large, juicy fruit with black skin and yellow flesh. The fruit of the new variety ‘Suplumfiftyfour’ also has a high Brix:Acid ratio, firm flesh, a mildly 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 ‘Friar’ (unpatented) and earlier than ‘Owen-T’ (unpatented). The fruit of the new variety ‘Suplumfiftyfour’ is larger than the fruit for ‘Friar’ (unpatented) and ‘Owen-T’ (unpatented).