I’m currently doing immersion watering. Can’t say much about how good or bad it is yet because this is my first year doing it this way for my tropicals. I was inspired to try it by an article written by Jack Wikle about keeping bonsai indoors.
I’ve got a shallow plastic storage container with a lid that I partially fill with water. I’m using a mix of tap and RO water and I add some Miracle Grow to the water at a relatively low dose. I put each pot in the container and let it soak for a few minutes (you can see air bubbles escaping for quite a while), then pick the pot up and let it drain back into the container, then put it back on the rack under lights. I have the shohin & mame sitting together in a mesh bottom tray so they can be picked up and watered en mass. When I’m done watering, I put the lid back on the container so that mosquitoes can’t get in there to lay eggs (hopefully). If I do notice mosquitoes getting in, I’ll drain it completely and sanitize it before starting over with fresh water.