Cover the layers with the original soil and let it decompose for 3–4 weeks before planting. 3. Liquid "Black" Fertilizer Recipe
Dark soil is fertile because it contains high levels of organic carbon (humus). You can achieve this "black" state through two main methods: Cover the layers with the original soil and
Remove the top 2–3 inches of existing soil to create space for organic layers. Cover the layers with the original soil and