Shredded bark is a slow-decomposing organic mulch suited to trees, shrubs, and perennial beds. It reduces evaporation and weed germination while protecting soil from compaction and sudden temperature changes.
- Pull weeds and water dry soil first.
- Spread roughly 3 inches (8 cm) over the root area.
- Leave 12 to 18 inches (30 to 45 cm) bare around a tree trunk or cluster of stems. Bark piled against living bark can hold damaging moisture and shelter rodents.
- Do not place plastic sheet under bark; weeds can grow above it and the barrier interferes with the soil as bark decomposes.
- Check depth before adding a fresh layer. Old bark does not disappear all at once.
The original page suggested raising a mower blade and passing over bark. Never drive a lawnmower over mulch. A mower can throw bark, stones, and hidden debris hard enough to injure someone. Make the mulched bed wide enough that an adult can keep the mower and trimmer completely outside it.