Full Comparison
| Factor | 🌿 Mulch (3") | 🪨 Landscape Fabric |
|---|---|---|
| Weed suppression | 90%+ (blocks light) | Good initially, degrades over time |
| Soil health | ✅ Improves soil as it decomposes | ❌ Blocks soil benefit; damages biology |
| Water permeability | ✅ Excellent | 🟡 Decreases over time as pores clog |
| Lifespan | 1–2 years before replenishment | 3–5 years (then becomes a problem) |
| Removal | ✅ Easy — just add new layer | ❌ Very difficult after years of use |
| Cost | $25–$50/yard | $0.05–$0.20/sq ft + staples |
| Best for | Flower beds, trees, gardens | Under gravel, driveways, paths |
| Earthworm activity | ✅ Supported | ❌ Blocked |
| Plant root access to nutrients | ✅ Full access | ❌ Restricted |
| Long-term verdict | ✅ Get better over time | ❌ Get worse over time in beds |
Why Landscapers Stopped Recommending Landscape Fabric in Beds
In the 1990s and 2000s, landscape fabric was standard practice under mulch. Most professionals now actively advise against it. Here's what changed:
- ✗It degrades into unremovable plastic mesh: After 5–10 years, fabric breaks apart into small plastic fragments mixed throughout the soil. Removing it means removing all the soil and starting over — a $1,000+ job for most beds.
- ✗Annual weeds still grow on top: Seeds blow onto the mulch surface and germinate there. Within 2–3 years you have the same weed problem, but now the fabric makes hand-weeding much harder.
- ✗Blocks the whole point of organic mulch: Organic mulch improves soil because earthworms and microbes process it. Fabric prevents this — you get zero soil benefit from years of expensive mulch.
- ✗Creates drainage problems: Fine soil particles clog the fabric pores over time. After a few years, water pools instead of draining, creating root rot conditions.
The Right Tool for Each Job
Flower bed or garden→ Mulch only
Apply 3 inches of shredded hardwood bark. No fabric. Replenish 1–2 inches every spring.
Mulch Calculator →Gravel driveway or path→ Fabric + gravel
Woven geotextile under 4–6 inches base gravel + 2–3 inch surface layer. Prevents sinking and weeds.
Fabric for Gravel Guide →Around trees→ Mulch only — no fabric
3–4 inch donut ring of wood chips. Fabric around trees restricts root growth and water absorption.
Tree Mulching Guide →Slope or erosion control→ Mulch + erosion netting
Use erosion control blankets (biodegradable) over seed, then top with mulch once plants establish.
Mulch Calculator →Skip the fabric — calculate your mulch
3 inches of mulch suppresses 90%+ of weeds with no long-term downsides.
Open Mulch Calculator →