I water into the soil, but feed with foliar method, ... (very hard to over-fertilize with foliar-feed, according to Ed Rosenthal), the plants draw it in better if sprayed from underneath to bottom leaf surfaces ... some may consider it a hassle, but it gives me extra time with my plants, to look pests, or problems, male pre-flowers, etc ... (I've never had pests, or males, or serious problems, so I guess it works) besides, I talk to them while I do that, free CO2 for them, as much as I talk ... ...