Your Compost Doesn't Fail—The Structure Does | How Aggregates Work

Most compost advice focuses on breaking material down—but not on how it actually behaves once it’s finished. In this video, I show how the same compost can turn into mud, dry into rock-hard clumps, or stay loose and crumbly—and why that happens. This isn’t about nutrients. It comes down to soil structure and aggregation—how particles come together and hold their shape. When structure is off, even “finished” compost can behave like clay. When it’s right, it stays fluffy, workable, and stable through moisture changes. I’ll break down what’s really going on in simple terms, and show how things like particle size, moisture, and structure control the final result. This concept applies to any compost or soil—but it’s especially easy to see in vermicompost (worm castings), where everything is broken down further and more evenly. If you’ve ever had compost that looked good but didn’t perform the way you expected, this will explain why.