Here's why:
* Clay: Clay particles are very small and hold water well, providing moisture for plants. They also hold nutrients, preventing them from leaching away.
* Sand: Sand particles are larger and allow for good drainage, preventing waterlogging and providing air for roots.
* Humus: Humus is decomposed organic matter that improves soil structure, increases water retention, and provides nutrients.
Loam is a balanced mix of these components, giving it a desirable texture, drainage, and nutrient content. It is often considered the "Goldilocks" of soils because it is not too heavy or too light, making it a great foundation for plant growth.