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Generally, you want the soil for your edible plants to have good drainage, organic matter for nutrients, a loose texture (like loam soil), and a balanced pH level. However, the type of plants you're growing will dictate the exact characteristics your soil needs to thrive. For example, brussels sprout prefers more acidic soil, while broccoli prefers more alkaline soil. 

If you’re using crushed stone or gravel as a base material, then yes, you should compact it to prevent movement of the top layers. For instance, if you don’t compact crushed stone or gravel and you lay pavers on top of them, the pavers will shift over time. However, if you’re using gravel or crushed stone as a top layer for aesthetic purposes, you might not want to compact the materials.

The difference between river rock and landscaping rocks is size, smoothness, and use. River rocks are smooth and flat, as if polished by water, and come in diameters between 1 and 8 inches. Landscape rock can vary in size from small pea gravel installations to car-sized boulders. However, landscaping and river rocks are interchangeable in many situations. River rock is best for pathways, walkways, garden bed mulch, water features, and planting accents, while small landscape rocks can serve as a walkway base, gravel playground areas, and filler between pavers.

There are two main times of the year to spread mulch—mid-spring and late fall. Spring mulching protects new seedlings as the soil warms up and the rainy season begins. Fall mulching insulates the soil and regulates its temperature as the first frosts arrive.