The colours you see in flowers come from the DNA of a plant. Genes in a plant's DNA direct cells to produce pigments of various colours. When the flower is red, it means that the cells in the petals have produced a pigment that absorbs all colours but red. When you look at that flower, it reflects red light. So, the flower appears to be' red. Flowers are the reproductive parts of plants. They attract insects to pick up pollen and transfer it to other plants and flowers. This helps the plant to reproduce. Some flowers change colour or fade over time. This is an indication to the pollinators that pollination is no longer needed. Many of the actual chemicals in the petals of a flower are called anthocyanins. These are water soluble compounds that belong to a bigger class of chemicals called flavonoids. Anthocyanins are responsible for creating blue, red, pink, pink and purple colours in flowers. Other pigments that produce floral colours include carotene (for red and yellow), chlorophyll (for green in petals and leaves) and xanthophyll (a pigment that produces yellow colours).
Ahints that the flowers are going to wither
Bhints that the cells in the flowers are drying up
Chints that pollination is not required
Dhints that pollinators are going to crowd around it