Tulasi Vivaha Puja is a significant and sacred ritual in Hinduism that marks the marriage of Goddess Tulasi (holy basil) to Lord Vishnu (or his avatar, Lord Krishna). It is traditionally observed on the 11th day (Ekadashi) of the Kartika month (November–December), and it is considered one of the most auspicious occasions for performing rituals for the well-being of family members and for seeking divine blessings.

Tulasi is a revered plant in Hinduism, symbolizing purity, devotion, and spiritual growth. It is believed that Tulasi is the embodiment of Goddess Lakshmi and a favorite of Lord Vishnu. According to mythology, Tulasi was once a mortal woman who was transformed into the sacred plant by Lord Vishnu after she devoted herself entirely to him. The Tulasi Vivaha Puja celebrates this divine union and is believed to bring prosperity, good health, and harmony to the household.

On this day, a Tulasi plant is ceremonially married to an idol or image of Lord Vishnu or Lord Krishna. Devotees clean the Tulasi plant and set it up in the puja area, decorating it with flowers and lighting lamps. The ritual involves offering sweets, fruits, flowers, and incense to the deity and the Tulasi plant. Chanting of Vishnu Sahasranama, Tulasi Ashtakshara Mantra, and prayers for health and prosperity are integral to the puja.

The marriage of Tulasi and Vishnu is symbolized by tying a sacred thread around the Tulasi plant, similar to the sacred bond of marriage. After the puja, devotees often distribute prasad and offer gratitude for the blessings of Lord Vishnu and Goddess Lakshmi.

Tulasi Vivaha Puja is not only a religious observance but also a celebration of devotion, purity, and harmony within the family.