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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.

Since the nature of the landscaping project can heavily influence the overall cost, it helps to understand what different types of landscaping projects cost on average. For example:

• Plant a tree: $100–$2,000

• Build a retaining wall: $3,250–$9,200

• Reseed a lawn: $450–$1,700

• Install a water fountain: $950–$4,800

• Install a paver patio: $2,400–$7,000

• Install a concrete walkway: $1,200–$2,400

• Install a flower bed: $800–$3,000

• Landscape lighting: $2,000–$6,000

Yes, you can put new mulch over old mulch, since it’s decomposable. The only reason you should remove old mulch before laying new mulch would be to maintain a certain aesthetic. 

Small gravel is the better option since it creates a stable, even surface that’s easier on paws and hooves. Large gravel can be uncomfortable and may shift too much underfoot. So if you’re using gravel in pet or livestock areas, go for smooth, rounded small gravel to prevent injuries and discomfort.