Yep! Shovel's right. I usually do 1/2 strength for foliar & also 1/2 strength regular soil drench feeding for young plants just starting. Here's something I do that I've never heard another grower mention. Since this is a potassium deficiency, I'd give it one feeding of a bloom food before going to a normal vegetative nute. Reason being, flowering nutes are higher in phosphorus & potassium than a veg nute, which is higher in nitrogen. You only need to do this once, & it works for me. Love NL, one of my all time favorites, very indica & it seems to be a heavier feeder. This deficiency likes to crop up just as young plants start their growth spurt, like when they leave the three leaflett stage. Next time, give your first feeding as soon as they put out the first leaf showing more than 3 leafletts, before they even uncurl all the way, & feed them at 1/2 strength. Beautiful little plants! ~~~ PEACE ~~~