There is no definitive answer to this question since it will vary depending on the climate and weather conditions where you live, as well as the type of potting mix your Tulsi plant is in. However, as a general rule of thumb, you should water your Tulsi plant every one to two weeks. Make sure that the potting mix is always moist but not soggy, and allow the top inch of soil to dry out between watering. If you live in an area with high humidity, you may need to water your Tulsi plant more often.To help ensure that your Tulsi plant gets the right amount of water, consider using a self-watering pot or planter. These pots have a built-in reservoir that stores water, which is then slowly released to the plant as needed. This can help cut down on the amount of time you need to spend watering your Tulsi plant, and it can also help prevent overwatering.