Rajnigandha won the Filmfare award for Best film in 1975. It was the debut film for Amol palekar in Hindi film Industry.
Dharmendra and Saira Banu make cameo appearances in the film.As both lead actors were new comers.Similarly Dharmendra gain appeared with Hema Malini in a cameo in Choti Si Baat 1976 in the song Jaaneman Jaaneman which had same lead pair of Vidya Sinha and Amol Palekar.
Basu Chatterjee wrote the script for Amitabh Bachchan and Shashi Kapoor. Shashi heard the story and told Basu that he had a winner with the story itself, only if they used newcomers.
Aparna Sen was the first choice for the role, but her price was too high. She also started demanding a established hero opposite her. Basu did not want to deal with her anymore. Next Mallika Sarabhai wanted to do the film, but her exams her coming up and that would delay the film.
Basu Chatterjee wasn't finding any distributors for the film hence he screened it at Mumbai's Aakashwani cinema which went on to become a hit.