Heavy feeders and light feeders look identical as seeds, and giving a sensitive strain the same dose as a hungry one burns the tips within a week. Most listings say nothing about feeding at all. A short feeding note on https://budweedseeds.com marks each strain as light, medium or heavy, and for the two I have grown the labels were accurate. It is not a feeding schedule, just a warning about where to start, which is enough to avoid the first mistake.