What works very well for me is to pick up the pot. (You might want to keep a dry pot on hand as a reference). A watered pot will have much more sense of weight than a dry one. With pot, you can, and sometimes should, let the pot get about as light as your dry ref pot. When i first planted into 2-gal pots, i didn't water for eleven days. I watered early too ... and not very much. cn