Hi JH! I just wanted to chime in as a fellow noob: this approach seemed kind of sketchy to me when I started and I was afraid I wouldn't be able to tell when it really needed water. If you have the same concerns, by chance, rest assured that half way through your first grow you'll be "weighing" pots like a pro! Once you do it for a couple of weeks, it's pretty easy to tell.lift the pot dry and remember the weight of the pot. Often times, it feels as light as air! time to water. When you do water the pot, lift it and note the weight. not time to water when the plant isnt heavy.