Turn your kitchen scrap into tea for your plants by placing them in a worm farm. The worms will help break down the scraps into a nutritional liquid.
They are a rich source of calcium and phosphorus. Additionally, they reduce acidity in the soil.
The water that you use to boil or steam your veggies is packed with nutrients, which can be a natural fertilzer for your plants.
Coffee drinkers can use the coffee grounds as fertilizer for their plants. They help increase the soil's acidity.
They are a rich source of potassium and also contain small amounts of nitrogen, phosphorus and magnesium.