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Food-grade diatomaceous earth is a natural product that comes from diatoms—fossilized aquatic organisms from tens of millions of years ago. Food-grade diatomaceous earth is considered "natural," while pool or filter-grade diatomaceous earth has been treated and transformed to have higher crystalline silica content.

The hydroseed mix—known as a slurry—helps grass seed take root in many ways. Water combines with the mulch, allowing the grass seed to stay moist while grounded in the soil. The extra fertilizer then provides the boost the seed needs to flourish. In just a few weeks, you'll be ready to break out the lawnmower again.

Yes, you can custom-color your gravel if you’d like. Use an acrylic- or oil-based paint designed for outdoor use, and apply sealant to protect it from the elements. Some companies offer customized color gravel, either mixing the colorant in a cement mixer with gravel or using industrial mixers to dye, paint, or color it.

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