GMSgrowsanswered grow question 4 years ago You could pour 5 gallons through that planter and that would not be overwatering. Doing it to often is overwatering. As long as your ph is good and you give more water around it to let the roots spread, you will be good. Watering just around the girl slows root growth, cus when they want to expand and the soil is dry they will just fill the wetted area. You can safely wet the entire planter just let it dry to a couple inches down before you water again. Cheers