Compared to other plants you might choose to grow, cannabis plants tend to need a relatively high amount of water. At times, you may need to supply water for your plants every one to two days or every two to three days. However, one of the best ways to know if your marijuana plants need water is to feel the soil. If the first inch of soil is dry, give your plant more water. If you choose to grow your cannabis plants in fabric grow bags, you should remain prepared to give your ganja plant more water than you would if it were growing in another type of container. The permeability of grow bags allows water to drain quite effectively. While this is overall a benefit, it can mean you’ll need to water more often when growing moisture-loving species such as pakololo plants.