Tulsi Vivah is a Hindu festival that celebrates the marriage of Lord Vishnu with the holy basil plant (Tulsi). It usually falls on the 11th day of the waxing phase of the moon in the Hindu month of Kartik (October/November). Here are the steps for performing Tulsi Vivah puja:

1. Clean the area where you will be performing the puja and decorate it with flowers and rangoli.
2. Take a bath and wear clean clothes.
3. Place a small pot or urn on a platform and fill it with water.
4. Put a Tulsi plant in the pot and decorate it with flowers, turmeric, and kumkum.
5. Light a lamp and incense sticks.
6. Recite the Tulsi Vivah mantra and offer flowers and prasad to Lord Vishnu and Tulsi Devi.
7. Offer Tulsi leaves to the deities and sprinkle water on them.
8. Chant the Vishnu Sahasranama or other prayers dedicated to Lord Vishnu.
9. Perform the kanyadaan ritual by tying a sacred thread around the Tulsi plant to symbolize the marriage.
10. Finally, offer aarti to Lord Vishnu and Tulsi Devi and distribute the prasad among the devotees.

Note: This is a brief overview of the Tulsi Vivah puja procedure, and the specific rituals may vary depending on the region and tradition. It is always advisable to consult a Hindu priest or a knowledgeable person before performing any puja.