A new and distinct plum tree variety, Prunus salicina, cv. ‘Suplumfortyeight’ is characterized by late season harvest and fruit having a pure yellow skin and a cling stone. The fruit is high in sugar and has medium-low acidity. The fruit of the new variety ‘Suplumfortyeight’ is also abundant in juice and has a sweet-neutral flavor. The harvest of fruit from the new variety starts about 27 days earlier than ‘Flavor Queen’ (U.S. Plant Pat. No. 7,420) and about 5 days later than ‘Suplumsix’ (U.S. Plant Pat. No. 2,747).
