Like any other plant, marijuana can only grow if you have water. But the thing here is that none of your water will be utilized even as the weed grows with the game minimized or turned off. What you can do instead is to plant your weed, then minimize or close the game for as long as it takes for the weed to grow. It won’t matter how much water you use, just as long as you use at least one bottle per pot.
Alternately, you can use the time lapse cheat to make your weed grow ASAP. Set the time ahead by the number of minutes it takes a certain strain to grow, then return to the game to collect the weed.
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