Ever go into your local flower shop, and wonder just how do they grow so being? How they grow to be so beautiful? Well, sometimes it is what you feed the planet, like in the 1960 classic "The Little Shop of Horrors".
"When the clumsy Seymour Krelboyne spoils two flowers of a client, the owner of a small florist shop Gravis Mushnick is ready to fire him. However Seymour tells that he has mixed two plants of different breeds at home and created a hybrid named Audrey Jr. and Mushnick decides to give another chance to his employee. On the next day, Seymour brings Audrey Jr. that becomes the pride and joy of Mushnick, his other employee Audrey Fulquard and clients. Out of the blue, the flower seems to be dying and Seymour accidentally learns that she likes blood. One day, Seymour is upset since he does not know how to feed the flower and he walks along a railroad. When he throws a stone near a railroad track, he accidentally hits the head of a man that falls on the track and is a train runs over him. Seymour brings the pieces of the man to the shop and finds that the plant likes flesh. On the next morning, Audrey Jr. has grown and become the attraction of the shop. But how will Seymour feed his plant ..." - IMDb.com
By far not one of his earliest films, but it does count up in that area. Roger Corman directed and produced this film. Considered by many a true classic in "black comedy horror" cinema. Interesting trivia. The 1986 version of "Little Shop of Horrors" was considered a remake of the 1960 version. However, the 1986 film was based on the stage productions of the same name.