Well the title pretty much says it all. It's my 1st time using grow bags & I'm unsure how much water to use in them. With plastic pots I watched for run off …. but do you do the same with grow bags ? I'm in the process of doing my final up-pots this week before flower & they are going in 5 - gal. bags & not sure how to tell when I've given the right amount of water. I already up-potted 5 so far & it took about 1/2 gal. water each just to get the sides of the pot slightly damp. So … how do I know when they have enough water ? And I'm guessing I can go by pot weight as usual to tell when to water again ?