“Flowers please the mind and grant prosperity. Hence, men with righteous deeds bestowed the name Sumana on them.”
―The Mahabharata book 13, Anusasana Parva Chapter 101, verses 19-21
According to this verse from the epic Mahabharata, when a pious man with a pure heart offers flowers to the deities, the deities become gratified and as a result bestow prosperity upon him.
Yes, flowers play a significant role in almost every religious ritual in Hinduism. Any religious ceremony, be it offering prayers or performing Aarti, is incomplete without flowers. Worshiping Hindu Gods and Goddesses with flower offerings is not only considered auspicious but has its own importance too. Although, any type of flower can be offered to any God yet, there are certain ones which happen to be the favorite flowers of Hindu Gods that can bring you good fortune if offered to Hindu Gods and Goddesses.

Know here what flowers do God and Goddesses love to get adorned with :