The crossword solution for the term 'Flower Source' is 'BUD'. A BUD is a small, undeveloped flower that is found on the stem of a plant. It is the first stage of a flower's life cycle and is the precursor to the full bloom. Buds are typically green in color and contain the reproductive organs of the flower. They are also the source of new growth for the plant, as they will eventually open up and become the flower.