Plum tree named ‘Suplumthirtyeight’

A new and distinct plum tree variety, Prunus salicina, cv. ‘Suplumthirtyeight’ is characterized by ripening very early in the harvest season, about ten days earlier than ‘Red Beaut’ (unpatented). The new variety is further characterized by relatively large-sized fruit for the season, smooth black skin, juicy amber flesh that has a sugar content of approximately 15° brix, and early full bloom compared to ‘Black Beaut’ (unpatented). The winter chilling requirement is estimated to be approximately 300 hours at or below approximately 7.2° C.