Peat Harvesting

Peat is partially decomposed plant matter that has accumulated in waterlogged bogs over thousands of years. As a fuel, it sits between wood and coal in energy density. In regions with peat bogs — Ireland, Scotland, Scandinavia, Russia, northern North America — it has been a primary fuel source for millennia and can be again. It requires no trees, no mining equipment, and no processing beyond cutting and drying.

Finding & Identifying Peat Bogs

Bog Types

Peat forms wherever plant growth exceeds decomposition, which happens in waterlogged, acidic conditions:

• Blanket bogs: Spread across flat or gently sloping uplands in wet climates. Often 1-5 meters deep. Most common in maritime climates (Ireland, Scotland, western Norway)
• Raised bogs: Dome-shaped deposits in lowlands, fed entirely by rainwater. Can be 10+ meters deep. Found across northern Europe and North America
• Fen peat: Forms in groundwater-fed wetlands. More nutriite than bog peat, often too wet and crumbly for good fuel

How to identify a potential peat bog:

• Look for flat, treeless wetland areas with sphagnum moss, heather, and cotton grass
• The ground feels spongy underfoot
• Water is stained brown/amber (tannic acid from peat)
• Cut into the surface with a knife — dark brown or black fibrous material below the living vegetation

Testing Peat Quality

Not all peat burns well. Quality depends on decomposition level:

• Lightly decomposed (fibrous, light brown, visible plant structures): Low energy content, lots of smoke, difficult to burn. Found in the top 30-50 cm
• Moderately decomposed (dark brown, some fiber): Good fuel. The bulk of most bogs
• Highly decomposed (black, dense, almost like coal): Best fuel, highest energy. Found in the deepest layers

Squeeze test: Take a handful and squeeze hard. If mostly water runs clear — too fibrous. If dark, muddy water runs out and the peat holds its shape — good fuel quality.

Depth Assessment

Push a long rod (metal rod, straight stick) into the bog to find the mineral soil beneath:

• Less than 50 cm: Marginal — mostly low-quality surface peat
• 50-200 cm: Workable fuel source
• 200+ cm: Major resource — years or decades of fuel supply

Cutting & Extraction

Hand Cutting Tools

The traditional peat-cutting tool is a slane (also called a “tuskar” or “slean”) — a spade with an L-shaped blade that cuts a rectangular block in one motion. If you lack a slane:

• A standard spade works but is slower (cut blocks in two cuts rather than one)
• A machete or large knife can cut pre-scored blocks
• The key is producing uniform blocks that stack and dry evenly

Cutting Technique

1. Strip the turf: Remove the top 10-20 cm of living vegetation and set aside (replace after harvesting to allow regrowth)
2. Open a bank: Cut a vertical face into the peat to work from. The bank should be 60-100 cm high
3. Cut blocks: Standard size is roughly 30 x 10 x 10 cm (length x width x depth). Consistency matters more than exact dimensions
4. Toss to dry: Throw each cut block onto the adjacent ground surface to begin drying
5. Work systematically: Cut one layer across the bank face, then step down to cut the next layer
6. Stop above the mineral base: Leave 10-20 cm of peat above the underlying clay/gravel to allow regeneration

Bank Management

• Work from one direction and don’t create isolated pillars — they collapse
• After harvesting a section, replace the turf cap to promote sphagnum regrowth
• Rotate cutting areas — never exhaust a single bank. Move to a new face each year
• A single person can cut 1,000-2,000 blocks in a full day of hard labor

Drying & Curing

Freshly cut peat is 80-90% water by weight. It must be dried to below 30% moisture to burn well.

Drying Stages

Week 1-2: Initial drying (“spreading”)

• Lay blocks flat on the ground in a single layer, spaced apart
• Turn every 2-3 days
• The surface crusts while the interior remains wet

Week 3-4: Footing

• Stand 4-6 blocks upright, leaning against each other in small teepee shapes
• Air circulates around all surfaces
• This is the critical stage — blocks must not sit in water

Week 5-8: Stacking (“clamping”)

• Build larger stacks (“clamps” or “ricks”) — criss-crossed blocks with gaps for airflow
• Cover the top with sod or a tarp to shed rain while allowing sides to breathe
• In good weather, peat is ready to burn after 6-8 weeks total drying

Weather Dependency

Peat drying is entirely weather-dependent:

• Ideal: Warm, windy, dry weather (summer in temperate regions)
• Acceptable: Intermittent rain is fine if blocks are footed (standing) — they shed water
• Problem: Extended wet weather during the spreading phase ruins the season’s harvest. Time your cutting for the driest forecast period

In wet climates (Ireland, Scotland), peat cutting traditionally begins in April-May for an August harvest.

Burning Characteristics

Energy Content

Fuel	Energy (GJ/tonne, dry)	Density (kg/m³, dry)
Well-dried peat	14-16	300-500
Air-dried hardwood	15-17	500-800
Coal (bituminous)	24-30	1,100-1,500

Peat is roughly equivalent to wood by weight but less dense — you need more volume. However, it is usually far more abundant locally than standing timber and regenerates (very slowly) while trees take decades to regrow.

Burning Behavior

• Slow, steady burn: Peat burns slowly with a long-lasting ember bed. Excellent for overnight heating
• Good coals: Produces fine, hot coals that retain heat for hours
• Smoke: More smoke than seasoned wood, especially if not fully dry. Burns best in a stove with good draft
• Ash: Produces moderate ash (5-15% by weight). Peat ash is mildly alkalite — useful as a soil amendment or for soap making
• Smell: Distinctive, pleasant smell. Peat smoke has been used for centuries to flavor whiskey and smoked foods

Stove Compatibility

Peat burns best in:

• Any wood-burning stove with a grate and ash pan
• Rocket stoves (break peat into small chunks first)
• Open fireplaces (traditional Irish method — stack blocks in a pyramid shape)
• Avoid using in stoves designed exclusively for coal — peat needs more airflow

Environmental Considerations

Regrowth Rate

Peat accumulates at roughly 0.5-1 mm per year in ideal conditions. A 2-meter-deep bog took 2,000-4,000 years to form. This means peat is effectively a non-renewable resource on human timescales. However, in a post-collapse context with drastically reduced population:

• A modest bog can supply a small community for decades
• Selective harvesting with turf replacement allows partial regeneration
• Peat should be viewed as a transitional fuel — used while establishing coppiced woodlands and other renewable energy sources

Sustainable Harvesting Limits

• Never drain a bog entirely — draining destroys the ecosystem permanently
• Harvest only from the edges, leaving the center intact
• Replace turf caps after cutting
• Rotate cutting areas with 20-30 year rest cycles
• A 1-hectare bog with 2 meters of peat contains roughly 3,000-5,000 tonnes of fuel — enough for one household for decades if managed carefully

See Also

• coppicing-fuel-management — Primary renewable fuel supply
• coal-surface-mining — Higher-energy fossil fuel alternative
• rocket-stove-design — Efficient combustion of peat chunks
• heat-storage-systems — Store peat’s slow heat output for overnight warmth

Peat for Non-Fuel Uses

Beyond burning, peat has several valuable applications:

• Garden soil amendment: Peat improves soil structure, increases water retention, and lowers pH for acid-loving plants (blueberries, potatoes, rhododendrons)
• Insulation: Dry peat is a reasonable thermal insulator. Historically used to insulate ice houses and root cellars. Pack between double walls or under roof
• Water filtration: Sphagnum peat has natural antimicrobial properties and can serve as a biological water filter (slow sand filter with peat pre-filter layer)
• Wound dressing: Sphagnum moss (the living top layer of peat bogs) was used extensively in World War I as wound dressings — it is naturally antiseptic and highly absorbent. Dry it and keep in your first aid supplies
• Preservation: The anaerobic, acidic environment of peat bogs preserves organic materials for millennia (“bog butter,” preserved leather, even human bodies). A useful natural cold storage for certain items

Labor Estimate

A realistic assessment of the work involved:

Task	Output	Time
Cutting (experienced)	1,000-1,500 blocks	Full day
Cutting (beginner)	400-700 blocks	Full day
Footing (setting up to dry)	2,000 blocks	Half day
Stacking into clamps	3,000 blocks	Half day
Transport to house (100m)	500 blocks by wheelbarrow	Half day

One household needs roughly 5,000-8,000 blocks per year for cooking and heating (with efficient stove). This represents roughly 8-15 days of total labor spread across the spring and summer — a modest investment for a year’s fuel supply.