In popular belief the deity is imagined as the spouse of Ganesha, hence the name "Kolabou" or "The Banana wife". The main frame of the form is made up of a leafy banana trunk and thus it is called "Banana wife". I think there is a meaning to this association. The other name of the Lord Ganesha is "Siddhidwata", meaning the giver of success and prosperity. In an agricultural society what can be more prosperous than fields full of crops, trees heavy with fruits and lush green vegetation?
Early in the morning the deity is taken to the bank of a river for the ceremony, among beating of the drums. In Kolkata it takes place mainly at the ghat of the river Ganga. At the start of the ritual the plants are immersed in the water of the river for washing. Then it is wrapped up in a new piece of cloth and the puja starts with the chanting of the mantras. The deity is offered fruits and sweets for Her pleasure. After all the rituals of puja are over the deity is taken back to the pandal and is placed by the side of the Ganesha.