The scent of flowers is of two kinds, agreeable and disagreeable. Those flowers which have sweet smell should be offered to the celestials.
द्विविधो हि स्मृतो गन्ध इष्टोऽनिष्टश्च पुष्पजः। इष्टगन्धानि देवानां पुष्पाणीति विभावय॥