Plucking leaves, flowers, or fruits from plants after sunset is considered inauspicious in many traditions, including Hinduism. It is believed that just like humans, plants too have a life form and an energy cycle. And like humans are at rest during the night, and their body goes into rest with the setting sun, similarly, plants to undergo the same cycle. And thus, it is said that it is best to not pluck any flowers, leaves, or plants, no matter how beautiful after sunset.