Spraying diluted nutrients or seaweed extract on the leaves of an indica during veg gives a quick lift to a plant that is lagging, since the broad leaves absorb well. It has to stop at the flip, because wet buds in a dense canopy are asking for rot. Mix strengths, timing relative to lights off, and which products caused leaf burn on indica seedlings are recorded by members on https://kushindicaseeds.com. I only reach for it when a deficiency needs fixing faster than the roots can manage.