Flowers of some plants bloom only at night. 

Yes, that's correct! There are many plant species whose flowers bloom only at night, a phenomenon known as nocturnal blooming. These plants are often adapted to attract pollinators, such as moths, bats, or certain species of bees, that are active during the night and are attracted to the scent, color, and shape of the flowers.

Nocturnal blooming flowers often have distinctive features that are designed to enhance their visibility and attractiveness to pollinators in low-light conditions. For example, they may have large, white or pale-colored petals that reflect moonlight or ultraviolet radiation, strong and sweet fragrances that can be detected over long distances, or specialized nectar guides or landing platforms that help guide pollinators to the reproductive structures of the flower.

Some examples of plants with nocturnal blooming flowers include evening primrose (Oenothera biennis), moonflower (Ipomoea alba), night-blooming cereus (Selenicereus grandiflorus), and yucca (Yucca spp.), among many others. Nocturnal blooming flowers are an important part of many ecosystems and play a critical role in the pollination and reproduction of many plant species.