Guides
Mulching basics
Mulching here is named-source material and depth notes — not a universal formula. Materials and depths stay on the cited sheets. This page does not promise a fertilizer plan.
One source per card. Named-source examples — not a national build sheet.
Illustrative photograph — not a cited bed.
What the sources say — at a glance
One source per card. Facts are not averaged.
Clemson HGIC 1604 (South Carolina)
Leaves 2–3 in, coarsely shredded. Pine bark 2–3 in. Fine wood/bark 2–3 in; coarse nuggets to 4 in.
Details and limits (4)
Material
Clemson HGIC 1604 (South Carolina): a 2- to 3-inch layer of leaves. It is best to shred the leaves coarsely, using a shredder or your lawn mower. Whole leaves have a tendency to blow away, while finely shredded leaves do not allow water to penetrate. Material and depth on their sheet.
Material
Clemson HGIC 1604 (South Carolina): a 2- to 3-inch layer of pine bark. Large pine bark nuggets float in water and may not stay in place during a heavy rain. Material and depth on their sheet.
Method
Clemson HGIC 1604 (South Carolina): keep mulch 2 to 3 inches away from the stems of woody plants. Many wood and bark mulches composed of fine particles should not be more than 2 to 3 inches deep. Coarse-textured mulches such as pine bark nuggets can be as deep as 4 inches. Method and depth on their sheet.
Limit
South Carolina HGIC 1604. Named materials and depths — not a national formula.
UMN Extension (Minnesota)
Wood chips, shredded bark, compost, straw, leaves, grass clippings. Straw weed-free. 2–4 in.
Details and limits (3)
Material
UMN Extension (Minnesota): organic mulches include wood chips, shredded bark, compost, straw, leaves, and grass clippings. Straw: make sure the straw is weed-free. Material names on their sheet.
Method
UMN Extension (Minnesota): apply mulch at a depth of 2 to 4 inches. Maintain a clear space between mulch and plant stems or tree trunks. Method and depth on their sheet.
Limit
Minnesota mulching sheet. Named materials and depths — not a national formula.
Maryland Extension (Maryland)
Leaves, grass clippings, straw, wood bark, and wood chips.
Details and limits (2)
Material
Maryland Extension (Maryland): organic mulches include tree leaves, grass clippings, straw, wood bark, and wood chips.
Limit
Maryland organic-matter sheet. Named materials — not a national formula.
Maryland Extension (Maryland)
Bark 1–3 in. Chips 1–3 in. Sawdust 1 in. Pine needles 2–3 in. Grass 1–2 in. Leaves 2–3 in.
Details and limits (2)
Method
Maryland Extension (Maryland): apply bark mulches 1 to 3 inches deep. Apply wood chips 1 to 3 inches deep and sawdust 1 inch deep. Apply pine needles 2 to 3 inches. Apply grass clippings 1 to 2 inches. Apply leaves 2 to 3 inches. Depths on their trees-and-shrubs sheet — not a national formula.
Limit
Maryland trees-and-shrubs sheet. Named depths — not a national formula.
Sources differ
Make it yours
Save the bed in the Field Book so next season is not a guess.
Verified suppliers only
No supplier on this page
When a partner is listed, it will be outbound and disclosed. Nothing to buy here. Fertilizer, soils, and pesticides stay off this slot.
Illustrative photograph — not a cited bed.
Bed construction also sits beside raised beds.
How we know — methodology. Ranges and assertions are cited per source, not blended.