Think it was from a short story collection and possibly the first story in the book. Around the early 80s.
A little girl is at her Grandma's house. The Grandma has lots of different coloured poppies in her garden and picks some to make dolls for the girl. The dolls are made by folding the petals down and wool tied round the middle to form a skirt, pieces of stem are used for legs and pushed through the petal skirt for arms and finally stamens are removed from the seed head and a face drawn on the seed head.