Edmond and Lucy have decided to offer to Mima her favorite flowers for her birthday: lilies. However, the kids have a problem : Mima's birthday is 7 days away, while the lilies will bloom in 11 days. Harriet and Polka always have the most helpful tips, and this is how Lucy and Edmond decide to give Nature a little help so as to speed up the process. But is rushing Nature's cycles a good idea?