https://www.hoyolab.com/article/32880782?create=1

Watering new grass seed is crucial for successful germination. For the first few weeks, water the area lightly but frequently, about 2-3 times per day, ensuring the soil remains consistently moist but not waterlogged. As the grass begins to sprout and establish roots, gradually reduce the frequency to once daily, then every other day, while increasing the amount of water each time. Consistent watering during the early stages is key to helping the grass grow strong and healthy