Many gardeners underestimate mulch’s lifespan. Beyond improving curb appeal, mulch protects the soil, regulates temperature, and slowly decomposes. Most organic mulches need a light annual refresh and a full replacement every 3–5 years, though Denver’s intense sun and sharp temperature swings can accelerate wear—especially in south- and west-facing beds. Shredded bark usually lasts 1–3 years, cedar and cypress around 2–4 years, and lightweight materials like leaves or compost often require seasonal replenishment. Rock and rubber mulches last far longer, sometimes a decade or more. Refresh mulch when it appears faded, patchy, compacted, or drops below 2 inches. A quick spring inspection helps you decide whether to top it up or replace it, improving moisture retention, weed control, and overall landscape health.
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