Confused why your compost pile isn't heating up or why it smells like ammonia? In this episode, Lucy tests Archer's composting knowledge as they explore the four key factors that make or break your compost: temperature, moisture, aeration, and particle size. Through a fun quiz format, they troubleshoot common composting problems—from soggy piles and pest issues to seasonal challenges and material-specific questions. Learn why eggshells take forever to break down, whether citrus peels belong in your bin, and how composting changes through the seasons. Whether you're struggling with your first compost pile or looking to optimize your existing system, this episode provides solutions to transform your organic waste into garden gold. The third instalment in our home composting series delivers actionable advice for composters at any experience level.