What Is Mulch & Why Your Garden Needs It: Types, Benefits & How to Apply

Mulch isn't just for looks—it's a workhorse that conserves water, suppresses weeds, protects soil, and feeds plants (if organic). Here's the complete lowdown.

Types of Mulch

Organic (breaks down, feeds soil)

• Bark, wood chips
• Leaf mold, compost
• Straw, hay
• Grass clippings
• Newspaper (shredded)

Inorganic (long-lasting, no nutrients)

• Decorative rock, gravel
• Decomposed granite
• Boulders, sand

Organic vs. Inorganic: Trade-offs

• Organic: Cools soil, adds nutrients, improves structure. Needs replenishing yearly.
• Inorganic: Warms soil, lasts years, clean look. No soil building.

What Mulch Does for Your Garden

• Cuts watering by retaining moisture.
• Blocks weed seeds from light.
• Prevents soil splash (reduces foliar diseases).
• Right mulch + right plant = healthier growth.
• Heavy mulch (gravel) stops erosion on slopes.
• Gives beds a finished, professional look.

How to Apply Mulch Correctly

• Depth: 2–3 inches over root zone.
• Don't volcano-mulch trees (keep away from trunk).
• Indoor pots benefit too.
• Weed fabric under mulch? Yes. Plastic? Never—blocks water/air. Already used plastic? Poke holes with a pitchfork.

Make Your Own Mulch

Shred fall leaves, chip pruned branches, save grass clippings (herbicide-free). Free, local, perfect.

Design with Mulch

Use texture/color to define beds: white rock under red roses, dark bark under chartreuse hostas. Mix materials for contrast. Mulch is the frame that makes the garden picture pop.