Das Dreimäderlhaus, adapted into English-language versions as Blossom Time and Lilac Time, is a Viennese pastiche operetta with music by Franz Schubert, rearranged by Heinrich Berté (1857–1924), and a libretto by Alfred Maria Willner and Heinz Reichert. The work gives a fictionalized account of Schubert's romantic life, and the story was adapted from the 1912 novel Schwammerl by Rudolf Hans Bartsch (1873–1952). Originally the score was mostly Berté, with just one piece of Schubert's, but the producers required Berté to discard his score and create a pasticcio of Schubert music.

Dorothy Agnes Donnelly was an actress, playwright, librettist, producer, and director. After a decade-long acting career that included several notable roles on Broadway, she turned to writing plays, musicals and operettas, including more than a dozen on Broadway including several long-running successes. Her most famous libretto was The Student Prince (1924), in collaboration with composer Sigmund Romberg.