well I haven’t seen a difference from watering either way, I find watering from the bottom promotes root growth towards the bottom of the pot, I’m watering from the top on this feed to aerate with peroxide, but I like to water from the bottom to make the roots search for water, instead of just spreading around the top, because once they have hit the water source, they will spread through the pot, and the more roots I get the better, but I want to make sure mine get down there, because that will promote large growth and extra oxygen into the roots because of air exposure. Thinking a little more I will want to watch for root rot and mild on the exposed roots.