Most fertilizer is already in your kitchen — you're just throwing it away. This guide covers five homemade fertilizers you can make from kitchen scraps: compost tea, banana peel water, eggshell calcium, coffee grounds, and worm castings. For each, learn what nutrient it feeds, how to use it, and which plants it suits — with honest notes on where each falls short. A simple, low-cost way to feed a container garden or raised bed and lean a little less on the store.