Hugelkultur

How to build

Build from the bottom up:

1. Trench (optional) — dig 1-2 ft deep where the mound will go
2. Logs — large logs at the base; partly-rotted wood is best
3. Branches and woody debris — fill gaps; smaller wood
4. Twigs, leaves, straw — fill remaining gaps
5. Compost or manure — if available, layer in
6. Topsoil — cover everything with at least 6-12 inches of soil
7. Plant — vegetables, perennials, fruit shrubs

Total height: typically 3-6 feet at construction; mounds settle over years as wood decomposes.

Why it works

The buried wood:

• Holds water — decomposing wood acts as a sponge; mounds typically need little or no irrigation after the first year
• Releases nutrients slowly — as wood decomposes, nutrients become plant-available over years
• Supports fungal networks — woody substrates favor fungal-dominated soil biology, which supports trees, shrubs, and perennial plants
• Builds soil — over a decade, the mound transforms into deep rich soil
• Creates microclimate — south-facing mound slope warms early; north slope stays cool; different microclimates on the same mound

Variations

• Small backyard hugel — 3-4 feet tall, 6-10 feet long; one-person buildable
• Hugel berms / swale-hugels — combined with swales for added water retention
• Sepp Holzer hugels — large 6-7 ft mounds at Krameterhof; integrated with terraces and ponds
• Sheet-mulched hugel — hugel topped with sheet-mulch / lasagna gardening layers
• Sunken hugel — buried wood with planting at ground level rather than mounded; works in some climates

Considerations

• Year 1 — mound is nitrogen-deficient as decomposers consume nitrogen; plant heavy-feeders sparingly the first year, or add nitrogen
• Tree species matter — [[black-walnut|black walnut]], conifers (cedar, [[juniper|juniper]]) inhibit some plants; deciduous hardwoods (oak, birch, maple) are best
• Settling — mounds drop substantially as wood decomposes; expect 1-2 feet of settling over the first few years

See also

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• Shares approach with: [[permaculture]] · [[soil-food-web]]
• Member of: [[practice]]

Sources

• Sepp Holzer’s Permaculture, Sepp Holzer (Chelsea Green, 2010)
• [[gaias-garden|Gaia’s Garden]], Toby Hemenway (Chelsea Green, 2009)
• Multiple permaculture publications

Rooted in life.