Landscape Mulch Guide: Types, Benefits & How Much You Need

Mulch is the most underrated upgrade in any Southern California landscape. A few inches spread over your beds holds moisture in the soil, blocks weeds, moderates root temperature through brutal summers, and slowly feeds the soil as it breaks down. Here is how to choose and use it.

Why mulch matters more in our climate

In the Inland Empire's long, dry summers, bare soil bakes and loses moisture fast. A 3-inch mulch layer can cut surface evaporation dramatically, meaning your plants stay hydrated longer between waterings and your water bill drops. Mulch also stops the soil from crusting over, which is common in our clay.

Types of mulch and when to use each

• Shredded bark: attractive and long-lasting; great for shrub beds and slopes because it knits together and resists washing away.
• Wood chips / arborist chips: inexpensive (often free from tree services) and excellent around trees and large beds.
• Compost mulch: breaks down quickly and feeds the soil; ideal for vegetable and flower beds.
• Gravel or decomposed granite: a permanent, fire-wise option for succulents, paths, and desert-style plantings.

How much mulch do you need?

Aim for a 3-inch depth. To find the amount, multiply the bed's square footage by 0.25 (feet) and divide by 27 to get cubic yards. For example, a 300-square-foot bed at 3 inches needs about 2.75 cubic yards. Keep mulch a couple inches away from plant stems and tree trunks to prevent rot.

Maintenance

Organic mulch breaks down and should be topped up once or twice a year. That slow decomposition is a feature, not a bug — it is what enriches your soil over time.

Frequently asked questions

Does mulch attract termites?

Keeping mulch a few inches from your home's foundation and wood siding avoids any issue; mulch in open beds is not a termite risk.

Is rock or wood mulch better?

Wood improves soil and suits most plantings; rock is permanent and fire-wise but does not feed the soil. Many yards use both in different zones.

Arbol Roble has cared for Inland Empire landscapes since 1997, serving Rancho Cucamonga, Ontario, Fontana, Eastvale, Corona and Riverside. Request a free quote or browse our residential and commercial services.