Test the pH level of soil in different areas, using a pH testing kit. Identify any areas where the pH level is too high. If the area is already covered with bark mulch, the mulch could be the cause of the imbalance because of a buildup of potassium and calcium.
Spread a layer of pine straw over high-pH areas and gently mix it in with existing mulch with a garden shovel to balance the soil.
Mix equal parts pine straw and bark mulch together. Spread a 2-inch layer of the mix over slopes and raised plant beds. The pine straw needles compact to prevent soil and bark pieces from washing away in heavy rains.
Spread pine straw and dried leaves over flower beds. Add 3 to 5 inches to retain moisture and deter weeds, but leave a circle around the base of plants to allow air to circulate. Pine straw and leaves decompose at the same rate so they don't block new flowers from growing.
Lay a circle of bark mulch or wood chips and pine straw around trees. Wood mulch naturally complements the color and texture of trees while the pine straw will add nutrients to the soil.
Mulch under the deck or around the patio with grass clippings, wood chips and pine straw to form an attractive, water-penetrable surface. The varied textures add visual interest and improve drainage while preventing weeds.