It's what every gardener wishes for: rich, dark, crumbly humus to plant in. Humus occurs naturally, of course. Picture the forest floor; a layer of fallen leaves covers rich dark soil. This soil is the result of year after year of plant and animal debris falling, decaying, and enriching the native soil beneath.

Few gardeners are blessed with perfect humus in their garden. We have to put effort into it, composting, building lasagna gardens, and mulching. But the benefits are worth it: strong root and foliar growth, few nutrient deficiencies, and great water retention are all side effects of planting an annual, perennial, tree, shrub, or vegetable in humus.