Watering cycle is like feeding your babe. They will tell you when they need water, just as they will tell when they need oxygen, when your soil is full of water, the root take what they need from the water. Then as it drys up, the root get the oxygen, as more air flows through your dirt. This is why, it good to let your soil dry a bit before watering. But dont let it dry up to the point, the soil is pulling away from the sides of pot. One good way of learning, this is to let them dry up and keep a good eye on them. She will feel light in wait, and she will drop youll know at that time just how far she can go with out water. Feed her and with in the hour she will be standing tall. Then youll know for sure.