I would personally water it in because I'm not familiar enough with foliar feeding. Just keep at it because it will take a couple weeks for it to start working.Foliar feed epsom salt during early flower. Bad idea. I got a plant I just watered and its in need of mag. Thought it was just hungry but keeps getting worse and looked up what it was from the leafs. Its mag. But can I do that or should I wait to water it in?