Why plants blooming at night usually have either large, brightly colored corollas of flowers

Why plants blooming at night usually have either large, brightly colored corollas of flowers (often white or yellow), or have a strong aroma

There are many nocturnal plants in nature. These include those in which flowers bloom only in the evening and at night. This means that the pollination process is carried out only by those insects that are activated at night. But in the dark, it is quite difficult for an insect to find flowers, so plants have special adaptations. Many of them have large light corollas, visible far in the dark. Others have a strong scent, by which they are detected by insects. These flowers include petunia.