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It depends. High-end colored mulch can be fairly costly. However, you'll have to replace less-expensive natural mulches, like pine needles and cedar mulch, more frequently. 

The cost is balanced out somewhat, though, as although you'll have to replace colored mulch less often, you'll have to replenish nutrients in your soil more frequently to make up for the decrease in organic matter and nitrogen from the mulch.

Sand is a common sublayer for hardscape features like driveways, paver patios, and more. Most projects that involve sand require a 1-inch layer to promote evenness, drainage, and weight distribution. For further drainage, most projects have a 6-inch minimum layer of gravel beneath the sand. 

Durable materials suited for climate include aluminum for coastal areas or composite wood in varying environments for durability and minimal upkeep.

That depends on the number of cubic feet in each bag. Ten 2-cubic-foot bags of mulch will cover 20 cubic feet, while 10 3-cubic-foot bags of mulch will cover 30 cubic feet. Learning how to DIY mulch can save you money and help you repurpose natural items such as wood chips, pine needles, and leaves.