There are tons of options. Outdoors I use our soil. Is great but needs a bit of a boost. I add composted manure and some dry organic bloom nutes. If I need just a emergency boost I am feeding a bit of cx horticulture growth enhancer. I prefer organic but it is hard to beat a fast chemical based kick when you want results now and don't have time to make a tea. If you don't mind waiting a bit longer for a boost, making a tea with earth worm castings, manure, and malt works wonders. Once flower starts I pretty much feed bloom nutes. The dry organic nutes I use are from Organically Done and are easy to just top dress with.