Answer: Moss is usually the result of poor drainage, acidic soil, and lots of rain - everything you'd typically find in the Pacific Northwest. You can keep moss from growing by digging the soil and amending it with compost to facilitate good drainage, adding lime to raise the pH, and/or covering the soil surface with a groundcover type plant or with bark chips. Fertile soil that's regularly worked rarely develops moss so why not start right now by adding a few inches of compost or aged manure over the surface of your beds, then digging it into the soil next spring? Add more organic mulch in late spring, then dig it into the beds in early fall. Sprinkle some lime on the soil surface in fall, then cover the lime with additional compost. By this time next year your beds should be moss-free. Best wishes with your garden!
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