Home Home Decor SECRET Fertilizer :) My fertilizing cocktail consists of mixing 1/2 bottle of cheap beer, 1 tablespoon of Epson salts, and 2 tablespoons of fish emulsion in a watering can (1-2 gallons). I do this to ALL my vegetable, flowers, and indoor plants. You will definitely notice the difference in a few weeks! Dont waste too much money on the beer. Cheapest still works great — plants arent picky!