A gram of healthy soil is home to as many as 500 million beings -- bacteria, actinomycetes, fungi, yeasts, protozoa, algae, etc.

Soil organisms create and maintain a complex warehouse and distribution system capable of storing and moving an abundant yet balanced supply of essential nutrients.

The gardener's most important job is to protect and help these creatures by composting, planting cover crops, adding organic soil amendments, and learning other beneficial practices.

-- Seattle Tilth's Maritime Northwest Garden Guide