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The most important thing to put under a rock garden is the appropriate soil. The specific soil needed will depend on the type of plants you’re growing as well as the environment you live in. You can also put non-woven or woven fabric under the rocks to add to the garden's structural stability.

Mulch costs anywhere from $30 to $150 per cubic yard, depending on several factors. On the lower end, common types like red and black mulch cost about $35 to $40 per cubic yard and are often made from recycled wood. More premium options like cedar, cypress, and rubber mulch can cost between $100 and $120 per cubic yard. The total cost is also influenced by delivery, which can be around $75 per cubic yard, though many companies provide a free estimate. It is generally cheaper to buy mulch in bulk and have it delivered, but buying it in bags may be more cost-effective for smaller areas. Other factors like the quantity you need, time of year, your geographical location, and professional installation will also affect the final price. Before getting quotes, it's a good idea to calculate how much mulch you need. A professional can help you determine the most suitable type for your landscaping needs.

A good gravel driveway should be built in layers using different sizes of gravel. A solid base layer of larger crushed stone (around 1 to 6 inches in diameter) provides stability and helps with drainage. Some recommend a middle layer of medium-sized gravel (2 to 3 inches). For the top driving surface, smaller gravel is best. A common recommendation is to use gravel between 1/4 inch and 1 inch in diameter, as it compacts well to create an even surface that's easy to drive on. Avoid stones that are too large, flat, or round to ensure the best traction. Using different layers ensures the driveway is durable, drains properly, and doesn't shift over time.

The best size river rock for your landscaping project depends on how you plan to use the stones. Generally, most river rocks used in landscaping are between 1/2 and 8 inches in diameter. For walkways and pathways, smaller rocks between 1 and 3 inches are suitable. For water features, medium-sized stones from 2 to 5 inches often work best. Garden beds can benefit from a mix of medium and large stones, ranging from 3 to 8 inches. These sizes can cover applications like decorative flower beds and drainage areas around foundations or retaining walls. For added visual interest, landscapers sometimes intersperse smaller river rocks with large boulders.