Getting mulch depth right
Mulch does real work in a garden bed — it suppresses weeds, retains soil moisture, and moderates soil temperature — but only within a fairly narrow depth range. Too thin and weeds punch through within weeks; too thick and it can suffocate plant roots or hold excess moisture against stems.
Why 2-3 inches is the sweet spot
Below 2 inches, sunlight still reaches weed seeds near the surface. Above 3-4 inches, water has a harder time reaching the soil underneath, and mulch piled against trunks or stems can encourage rot. Most landscaping guidance converges on 2-3 inches for a reason — it’s the range that solves the weed/moisture problem without creating new ones.
Buying in bulk vs. bags
Bagged mulch is usually sold in 2 cubic foot bags. Once a project needs more than roughly 2-3 cubic yards (27-40+ bags), bulk delivery is almost always the better value — most landscaping suppliers deliver by the yard at a lower effective cost than the equivalent bags.
Refreshing existing beds
If a bed already has mulch from a previous season, you often don’t need a full new layer — measure the existing depth first and only add enough to bring it back to 2-3 inches total, rather than starting the calculation from zero.