According to our cultural heritage, the devotees offered flowers, fruits & leaves to God in temples & places of worship. Thus the process of their cleansing happened through aromatherapy. From the vedic period kings used to offer cows and vanamulikas to not only Gods and Goddesses but also Rishis and Munis. As deities have their favourite flowers and leaves while some are prohibited from offering.
The Ganesh Vanam has overall 21 trees in the premises with ayurvedic and medicinal properties.