Sometimes, but not always. It depends on what material you’re installing (mulch vs. rock) and what problem you’re trying to solve.
Under mulch: fabric can create long-term issues because mulch breaks down over time. That organic material turns into soil on top of the fabric, and weeds can still grow in that new layer. Fabric can also:
- limit soil improvement over time (mulch is meant to feed the soil)
- become exposed as mulch shifts or thins
- make future planting or bed refreshes harder
Under rock: fabric is more commonly helpful because it can:
- reduce mixing between rock and soil
- help the bed look cleaner longer
- make maintenance and future refreshes simpler
Our approach: we recommend fabric based on your material plan, bed design, and site conditions. The goal is a bed that looks good now and stays manageable long term — not a “one-size-fits-all” install.
Helpful next step: Learn more about mulch vs. rock landscape beds and native mulch.