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.degree. 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.degree. C.