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There are several ways to improve poor quality garden soil. Adding compost or aged manure increases organic matter and nutrients. Mixing in peat moss or coconut coir helps sandy soil retain moisture. For heavy clay soil, work in pine bark mulch or gypsum to improve drainage. Test your soil’s pH annually through your local [https://www.npic.orst.edu/reg_soil_testing.pdf] and amend with lime or sulfur as needed. Rotate crops and plant cover crops like clover between growing seasons to prevent nutrient depletion.