Mulch Basics: Your Complete Guide to Types, Application, and Maintenance

The Benefits of Mulching

Beyond giving gardens a clean, freshly planted look, mulching is one of the best ways to maintain soil moisture, insulate roots from temperature extremes, and minimize weeding.

What Is Mulch?

Mulch is any material that protects the soil surface while allowing air and water penetration. Organic mulches (plant-derived) add nutrients and improve soil composition over time. Options include compost, aged manure, raked leaves, pine needles, and herbicide-free lawn clippings. Inorganic choices like gravel, granite, or stone are also effective.

Common Questions Answered

Will manure burn plants? Only if not well-composted. Look for "well-composted manure" on labels or confirm with bulk suppliers.

How much to buy? A 2-cubic-foot bag covers 8 square feet at 3 inches deep; 1 cubic yard covers 108 square feet at the same depth.

How thick to apply? Denser mulch particles require thinner layers.

Application tips? Keep mulch a few inches from tree trunks and plant crowns to prevent rot.

Keeping mulch clean? Remove debris with a small hand rake; blowers may displace lighter mulches.

When to mulch? At least annually in early spring before weeds sprout; add a second layer in late fall if desired.

When to remove it? Mulch can remain indefinitely—just scrape aside for planting.

Container mulching? Use the same depth and technique as in-ground applications.

Six Favorite Mulch Materials

• Straw: Light, loose, good for vegetable beds. Apply 4-5 inches. Avoid hay (contains weed seeds).
• Hazelnut hulls: Ideal for paths—water permeable, don't stick to shoes. Apply 2-3 inches.
• Cut bark: All-purpose, polished look. Mini size: 2-3 inches; larger: 4-5 inches.
• Decomposed granite: Compacts quickly, resists blowing. Good for Southwestern landscapes. Apply 1-2 inches.
• Shredded bark: Slow decomposition, natural look, knits together. Useful on slopes. Apply 2 inches.
• Tumbled glass: Decorative, expensive ($3-7/lb). Apply 2-3 inches.