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Gorilla Hair Mulch

Gorilla hair mulch is finely shredded redwood or cedar bark, cut into long, stringy fibers that knit together into a dense mat once installed. It is a Western product, most common in California and the Southwest, prized for staying put on slopes and in windy sites where chunky bark or hardwood mulch tends to migrate. Available in natural reddish brown or dyed black.

Gorilla Hair Mulch

What Gorilla Hair Mulch Is Used For

Slopes and erosion control

This is the signature use for gorilla hair. The long fibers interlock and mat together, resisting sliding or washing downhill far better than chunky or loose mulches. On steep or long runs it may need staking or fabric until it initially knits, and once fully matted it can shed heavy rain in sheets rather than absorbing it, so grading and drainage still matter underneath.

Best for slopes, berms, and erosion-prone banks

Wind-exposed decorative beds

Because the fibers mat instead of sitting loose, gorilla hair resists blowing away in open, windy sites where lighter bark or straw mulches scatter. It holds its shape around foundation beds, medians, and exposed corners of a property without constant re-raking or replacement after storms.

Best for open, breezy landscape beds and street-facing borders

Commercial and HOA landscape beds

Slow decomposition and strong color retention mean fewer touch-ups, often only every 3 to 4 years, which appeals to properties on a maintenance schedule. It costs more per yard than standard shredded hardwood mulch, and its dense, uniform mat reads more formal than a naturalistic wood chip bed, so it fits manicured commercial and HOA aesthetics well.

Best for low-maintenance commercial and hoa plantings

Beds around established shrubs and trees

Gorilla hair works well long-term around mature, deep-rooted plants that do not need frequent soil disturbance or reseeding. It is a poor choice for vegetable gardens, annual color beds, or areas meant to self-seed, since the tight mat blocks seedling emergence and makes seasonal soil work difficult.

Best for permanent shrub and tree beds, not annual gardens

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More About Gorilla Hair Mulch

Specifications

Fiber size
1/8 to 3/4 inch wide, several inches long, stringy and hair-like
Coverage per cubic yard
About 324 sq ft at 1 inch, 160 sq ft at 2 inches, 100-110 sq ft at 3 inches
Recommended depth
2 to 4 inches
Weight per cubic yard
Roughly 400-800 lbs loose, heavier once wet and matted
Color range
Natural reddish brown to dark brown/black, or pre-dyed black
Matting behavior
Fibers interlock into a blanket-like mat within weeks
Water behavior
Sheets water across the surface once matted rather than soaking through
Lifespan
3 to 4 years before color fades and volume needs topping off

What it actually is: shredded redwood and cedar bark

Gorilla hair mulch is not a species of tree, it is a texture and grading of bark, almost always redwood or red cedar, shredded finely into long, stringy fibers rather than chipped into chunks or nuggets. That shredding process is what gives the product its shaggy, hair-like look and its name, which stuck mainly on the West Coast where redwood and cedar byproducts are widely available from regional mills. The natural oils in redwood and cedar make the fibers somewhat more insect and rot resistant than softer wood mulches, and they hold color longer, which is why this product typically lasts 3 to 4 years compared to one or two seasons for many shredded hardwood mulches. It is sold in its natural reddish brown to dark brown color, or dyed black with a non-toxic colorant for a more uniform, formal look against pavers, stone, and building facades.

Installing it correctly so it mats instead of migrates

Because gorilla hair's whole value proposition is the mat it forms, installation technique matters more than with chunky mulch. Clear the bed of weeds first, since the interlocked fibers make it hard to pull anything out once matted. Apply at 2 to 4 inches, not deeper, because piling it thicker traps moisture and air away from roots and slows water penetration even further. On slopes, rake it into a consistent layer and consider light staking or a jute net until the fibers knit together over the first few weeks. Keep it a few inches back from tree trunks and house siding to avoid trapping moisture against bark or wood, since mulch volcanoes invite rot and pests regardless of material. After the first watering or rain, expect the surface to begin binding into a single mat rather than staying loose like bark chips.

How It Compares

Compared with shredded hardwood or chunky bark mulch. Gorilla hair's long fibers interlock into a stable mat that resists wind and slope erosion far better than chunky bark, which stays loose and can float or migrate in heavy rain. Chunky mulch decomposes faster and enriches soil sooner, while gorilla hair lasts longer but returns organic matter more slowly.

Compared with pine straw. Pine straw is lighter, cheaper, and breaks down within about a year, while gorilla hair holds up 3 to 4 years. Pine straw drains between needles more easily and suits acid-loving plants, whereas gorilla hair's tight mat sheds surface water more than it lets it soak through.

Ordering and Coverage

How much do I need to order. Use the formula square footage times depth in inches, divided by 324, to get cubic yards. At the recommended 3 inch depth, 1 cubic yard covers roughly 100 to 110 sq ft, versus about 160 sq ft at 2 inches or 324 sq ft at just 1 inch. Measure your bed or slope area first, decide on depth based on how much erosion resistance you need, and round up slightly since matted fiber settles over time and thin spots invite weeds.

How it is sold and delivered. Gorilla hair mulch is sold and delivered in bulk by the cubic yard, dropped as a loose pile at your property for larger beds, slopes, or commercial jobs. It is heavier than chunky bark once wet, roughly 400 to 800 lbs per cubic yard loose, so plan equipment or extra hands for spreading larger orders across sloped or hard-to-reach areas.

Common Gorilla Hair Mulch Questions

What is gorilla hair mulch actually made from
It is shredded redwood or red cedar bark, finely shredded into long, stringy fibers that resemble coarse hair, which is where the product gets its name and its distinct matted texture.
How much do I need to order for my project
Use square footage times depth in inches, divided by 324, to get cubic yards. Roughly 1 cubic yard covers 100 sq ft at the recommended 3 inch depth, less at greater depths.
How long does it last before I need to reapply
Typically 3 to 4 years, since redwood and cedar fiber resist rot and decompose slowly compared to softer wood mulches, though color fades gradually well before the volume needs replacing.
Is it safe to use near my house or in a wildfire-prone area
No. Fire-safe councils in wildfire-prone regions specifically discourage shredded redwood or cedar mulch near structures because it is highly flammable, and irrigation cannot reliably offset that risk in dry, windy conditions.
Is it safe for pets and kids to play around
The plain material is non-toxic and dyed versions typically use pet-safe colorants, but the loose stringy fibers can be pulled apart and chewed, creating a minor choking or ingestion risk for small pets and young children.