Mulching

Practical

Common mulch materials by context:

• Vegetable garden — straw, salt hay, leaves, shredded paper, untreated compost. 5–10 cm depth.
• Perennial beds, orchards, food forests — woodchip (especially ramial chipped wood — small-diameter branches with high lignin and high microbial value), fallen leaves, [[comfrey|comfrey]] leaves chopped-and-dropped. 8–15 cm depth.
• Sheet mulching — overlapping cardboard or thick newspaper as a weed-smothering base layer, topped with compost and organic mulch. Used to convert lawn or weedy ground to cultivation in a single season.
• Living mulch — low-growing perennial groundcovers (clover, creeping thyme, yarrow, alpine [[strawberry|strawberry]]) that occupy [[soil|the soil]] surface continuously.
• Field-scale residue mulch — terminated cover-crop residue, crop stubble, baled-and-spread straw under [[no-till-farming|no-till]] management.

What to avoid:

• Dyed wood mulch — synthetic dyes; often made from construction debris of unknown chemistry.
• Hay (vs straw) — hay carries weed seeds; straw is the harvested-grain stalk after seed has been removed.
• Black plastic — kills soil biology, doesn’t decompose, leaches microplastics. Geotextile fabrics are not better.
• Mulch volcanoes around tree trunks — piling mulch against bark causes rot, pest entry, and circling roots. Keep a clear ring at the trunk.

Scientific

Mulch produces several measurable effects:

• Soil moisture — reduces evaporation by 20–60% under typical conditions; particularly effective in [[soil|the soil]]‘s top 10 cm where most root biomass concentrates.
• Temperature buffer — soil under mulch is cooler in summer, warmer in winter; smaller diurnal swings.
• Weed suppression — light exclusion prevents most weed seed germination; thick mulch blocks emergence even of established perennials over time.
• [[soil-organic-matter|Soil organic matter]] — organic mulches decompose into humus; long-term mulched soil consistently shows higher SOM than bare-cultivated soil.
• Microbial habitat — the mulch-soil interface concentrates fungal and bacterial activity; ramial woodchip in particular fosters fungal-dominated [[soil-microbiome|soil microbiome]].

Cultural

Ruth Stout’s deep-mulch system (popularized in Gardening Without Work, 1961) is the canonical American household-scale mulching tradition: 20–30 cm of straw or hay maintained continuously over vegetable beds, with no tillage, no irrigation, and no synthetic input. Paul Gautschi’s Back to Eden gospel-and-gardening film (2011) brought ramial woodchip mulching to a wide audience. The Japanese natural-farming tradition ([[masanobu-fukuoka|Fukuoka]]) treats mulch and cover-cropping as effectively the same practice.

Lenses still to grow

• Ramial chipped wood (RCW) specifically — its discovery as a fungal-soil-builder by the Université Laval research group in the 1970s
• Ruth Stout and the deep-mulch tradition
• The mycorrhizal-and-fungal-soil benefit of woodchip vs nitrogen-rich green mulches
• Sheet mulching as a lawn-conversion tool

See also

Auto-generated from this entry’s typed relations: frontmatter, grouped by relation type so the editorial signal isn’t flattened.

• Enables: [[no-till-farming]]
• Shares approach with: [[cover-cropping]]
• Member of: [[practice]]
• Heals: [[soil-erosion]]
• Supersets: [[chop-and-drop]]

Sources

• Ruth Stout, Gardening Without Work
• Lemieux et al. (Université Laval), ramial chipped wood research papers
• Toby Hemenway, [[gaias-garden|Gaia’s Garden]] (sheet-mulching reference)
• USDA-NRCS Soil Health technical notes on residue management

Rooted in life.