How do you keep plants fed and satisfied using sustainable methods? I'm growing my first ever garden and I only put organic compost and organic manure in, mixed with some existing dirt. I have plenty of conventional (miracle gro etc) fertilizer but I do not want to use it because its not really sustainable at all, in that I will have to drive to the store to get this product when it runs out if i do use it. Am I right on this? What should I use as fertilizer if anything? My vegetables need more nitrogen I think, and food in general, they are a light green color.