Anything over 3 inches in most planting areas crosses into risky territory.
Signs You’ve Over-Mulched
- Mushrooms or sour, swampy smells
- Water pooling instead of soaking in
- Yellowing leaves despite adequate watering
- Bark damage or rot near plant bases
These are signs that roots aren’t getting enough oxygen.
The #1 Mulching Mistake: Mulch Volcanoes
Piling mulch against tree trunks or plant stems—often called a mulch volcano—is one of the most damaging practices in home landscaping.
Why It’s Harmful
- Traps moisture against bark, leading to rot
- Encourages pests and fungal disease
- Forces roots to grow upward instead of outward
The Right Way
- Keep mulch 2–3 inches deep
- Pull mulch 2–3 inches away from trunks and stems
- Think donut, not volcano
Trees and shrubs thrive when their root flares are exposed and dry.
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