Celebrate a Happy Birthday by growing "Cosmos". Pink with a red tinge around the yellow centre the cosmos is a joyful looking flower. Grown originally by the Christian priests in Mexico, where the flower originates, the even way that the flowers are arranged led them to christen the plant "Cosmos", the Greek word for harmony or ordered universe. Expect the seeds to germinate within 15-20 days and produce flowers 20 weeks after that.