The term 'Flower-to-be' is a phrase used to describe a plant that is in the process of becoming a flower. The two crossword solutions for this term are BUD (3 letters) and SEED (4 letters). A BUD is the first stage of a flower's development, when the petals are still tightly closed. A SEED is the next stage, when the flower has been pollinated and the petals have opened. Both of these stages are necessary for a flower to fully develop and bloom.