Why do people recommend watering every 3 days or so? Why not water just a little bit every day? Also, how much water for a few small plants. I'm growing outdoors in 5 gallon fabric pots with Michigan super soil mix. I started late. My plants are only about 15" and about to start flowering. Been doing 3 gallon jugs of water every 3 days for 6 plants. More, less, or about right?