Read one of the following books to the class; Pumpkin Circle: The Story of a Garden by George Levinson or Pumpkin Pumpkin by Jeanne Titherington. They are both about the life cycle of pumpkins. These are short books, so the order of events should not be that difficult for the children to remember.
Type up a generic list of the events of the life cycle of a pumpkin. Mix up the entire list so that all of the events are out of order. Give each child the mixed-up list, a sentence strip, a sheet of green construction paper, a sheet of orange construction paper, a small square of yellow tissue, a pumpkin seed, and a di-cut or color sheet of a large pumpkin.
The children use all of their materials to glue the steps of the growth of the life cycle of a pumpkin in order, and make the process as they go along. They will start with the seed, then use the tissue paper to make the pumpkin flower, then use the construction paper to make a small green pumpkin and a small orange pumpkin, and finally use the di-cut or the color sheet for their final grown pumpkin. All of these things are glued on the strip in a sequence of events.