Best Raised Bed Liners: Do You Actually Need One?
Raised bed liners are one of the most misunderstood accessories in gardening. Some gardeners swear they extend a wooden bed’s life by years; others say they trap moisture and cause rot. The truth is that it depends on the bed and the liner. Here is what a liner actually does, when you need one, and the best options based on the materials and owner feedback across the market.
At a Glance
- Best Overall: Woven landscape fabric (DeWitt or similar) — breathable, blocks weeds, lets water drain.
- Best Pest Barrier: 1/4-inch hardware cloth (YARDGARD or similar) — stops gophers and voles.
- Best for Wood Protection: Commercial raised bed liner fabric or landscape fabric on the interior walls.
- Skip It If: your bed is galvanized steel or aluminum — these frames do not need liners.
What a Liner Actually Does
A liner sits between the bed frame and the soil. It can do three separate jobs, and you should match the liner to the job:
- Keep soil in. In beds with slatted or wide-gap walls, a liner stops soil from washing or sifting out.
- Block weeds and pests. A barrier across the bottom stops weeds from growing up from below and blocks burrowing animals from tunneling in.
- Protect the frame. Keeping soil from constant contact with wooden walls slows moisture-driven decay — which is the main reason to line a wooden bed.
When You Need a Liner — and When You Do Not
Line a wooden bed (usually yes)
Untreated wood in direct contact with damp soil rots faster, especially in humid climates. A breathable fabric liner on the interior walls dramatically slows that decay by keeping soil off the wood while still letting the frame breathe. This is the classic “we should have lined it sooner” scenario owners report after replacing a rotted bottom board.
Line the bottom for pests (only if you have them)
If gophers, voles, or moles are active in your area, hardware cloth across the bottom is the permanent fix — these animals chew straight through landscape fabric. If you do not have burrowing pests, a bottom liner is optional. Many gardeners skip it entirely and rely on the open bottom for drainage. Learn more about keeping soil biology healthy in our soil health guide.
Do not line a metal bed
Galvanized steel beds do not rot, so interior liners do nothing useful — and in hot climates, a fabric liner against a steel wall can actually hold moisture against the frame. For metal beds, skip the liner; the open bottom is a feature, not a flaw.
Comparing the Main Liner Types
Woven landscape fabric — Best Overall
Woven polypropylene fabric (DeWitt is a well-established name) is the workhorse choice. It is breathable — water and air pass through — while blocking weeds and holding soil. It lasts several seasons, cuts to size with scissors, and staples easily to wood frames. Use it on the interior walls, and optionally on the bottom where pest pressure is low.
Hardware cloth — Best Pest Barrier
Galvanized hardware cloth with 1/4-inch mesh is the only reliable barrier against gophers and voles. It does not hold soil by itself — small particles sift through — so pair it with landscape fabric on top when using it as a bottom layer. It lasts for decades and is cheap per square foot.
Plastic sheeting / pond liner — Use with caution
Heavy plastic or EPDM pond liner is waterproof, which is exactly the problem in most climates: it traps moisture against the frame and can waterlog the soil from below. It is mainly useful for decorative beds with no drainage needs. If you use it, add drainage holes and never use it on the interior walls of a wooden bed in a wet climate.
Commercial raised bed liner fabric — Most convenient
Purpose-made raised bed liners sold in rolls are usually thick, needle-punched fabric with good breathability and a long lifespan. They cost more than landscape fabric but are pre-sized to common bed dimensions and are the easiest option to install correctly the first time.
How to Install a Liner (in 10 Minutes)
- Staple hardware cloth across the bed bottom (if using it), leaving the edges loose until the fabric is on.
- Cut landscape fabric to fit the interior walls plus the bottom, leaving 2–3 inches of overlap at the top edge.
- Staple the fabric to the top rim of the frame, smoothing it down the walls and across the bottom.
- Trim excess at the corners; overlap seams by 6 inches so soil cannot find gaps.
- Fill with soil — the liner settles against the walls as the bed fills. That is it.
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Woven landscape fabric on Amazon
Purpose-made raised bed liners on Amazon
FAQ
Do I need a liner in a galvanized steel raised bed?
No. Steel does not rot, and the open bottom is designed for drainage. Adding a liner to a metal bed is wasted effort, and a non-breathable one can trap moisture and harm soil life.
Will a liner stop weeds from growing in my raised bed?
A bottom liner stops weeds from growing up from the native soil below, which is a real benefit. It will not stop weed seeds that blow in from above — for that, use mulch on the soil surface. See our weed suppression guide for the full system.
Can I use plastic bags or tarps as a liner?
Only for very short-term projects, and even then it is not recommended. Non-breathable plastic blocks drainage, traps moisture against the frame, and eventually tears, leaving you with a mess. Spend the few dollars on landscape fabric — it lasts years.
How long does landscape fabric last in a raised bed?
Quality woven fabric typically lasts 5–10 years in a raised bed, which is usually longer than the bed’s first soil cycle. UV exposure is the main killer, so the buried portions last longest; the exposed top edge is what you should inspect each spring.
Bottom Line
Line wooden beds to slow rot and block weeds; line the bottom with hardware cloth if you have burrowing pests; skip liners on metal beds entirely. Breathable woven landscape fabric is the best all-round choice for most gardeners. For more on building and maintaining healthy raised beds, start with our raised bed guide.
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