There really isn't a large selection of quality organic nutrients\plant foods for Cannabis at a home improvement store. They don't sell liquid nutrients (which many find more convenient) or most of the brands people discuss here. But, there actually is an excellent brand of dry granular organic plant food made by the Espoma company which is very widely available. Look for any of the Espoma "-Tone" products, especially Bio-Tone Starter Plus. You can mix these dry plant foods into your medium prior to a transplant, or top-dress with them. These are complete organic plant foods but keep in mind that they are really to prevent deficiencies in the first place and if you have any upon application it may take several days to resolve.