There are a lot of reasons to avoid store-bought fertilizers, price being one of them. This fermented emulsion is nearly free and provides a big nitrogen boost.

To help your garden thrive, consider using some specific leftover scraps from the kitchen to create a batch of fertilizer with lots of nutrients.

Who needs soil to sow a sustainable garden? You can cultivate plants in mid-air, float them in mineral-enriched water or add nutrients for an organic harvest by using your own fish for the fertilizer.