In Hinduism, it is not just the Gods and Goddesses that are worshipped, revered, and looked up to, there are also elements of nature, like Agni, Vayu, and even trees that are worshipped. In Hinduism, there is a deep connection between the soul and nature, and thus humans pray to plants and trees just like they do to Gods.
And of the simplest ways people worship nature is by lighting a lamp near the plants and trees.
And here we mention 4 trees in front of which a Diya is lit for prosperity and happy life.