Mulch Done Right: Depth, Timing, and the Volcano Mistake

Good mulch holds moisture, smothers weeds, moderates soil temperature, and frames a bed beautifully. Bad mulch — piled too deep or heaped against trunks — does the opposite, suffocating roots and inviting rot. The difference comes down to a few simple rules.

Get the depth right

Two to three inches is the target for most beds. Thinner than that and weeds push through; thicker and you can starve the soil of air and water. Before adding a fresh layer, loosen and check what's already there rather than burying it deeper each year.

Avoid the mulch volcano

• Keep mulch a few inches away from tree trunks and plant stems — never cone it up around them.
• Pull mulch back from the foundation and any wood siding to avoid trapping moisture.
• Refresh, don't rebuild — fluff existing mulch before deciding how much to add.

Done well, a single annual mulching keeps beds healthy and tidy through the whole season. It's a small job with an outsized payoff when the depth and placement are right.