NSCannaanswered grow question 4 years ago Cannabis prefers a wet to dry cycle of watering, so make sure not to water until the soil is quite dry. I use the pot lift method and check the top 2 inches with my fingers. When I was in 5 gallon pots on my first grow, I was watering roughly every 6-7 days. I learned by keeping a separate pot filled with dry soil to learn the weight.
You can also read the leaves of your plants when you check them in the morning, if they're starting to droop, soil feels dry and the pot is light, it's time to water.