Should You Line a Wooden Raised Bed? (We Tested 4 Liners)
Should you line a wooden raised bed? It is the question every first-time cedar bed owner asks after the first season of soil contact. The short answer: yes, a breathable liner on the interior walls is usually worth it, and hardware cloth across the bottom is worth it if you have burrowing pests — but the wrong liner can do more harm than good. Here is how four common liner options compare, based on the materials and what owners report over years of use.
At a Glance
- Best for the walls: Woven landscape fabric — breathable, blocks soil-to-wood contact, lasts years.
- Best for the bottom: 1/4-inch galvanized hardware cloth — the only real gopher and vole barrier.
- Best two-layer system: Hardware cloth on the bottom + landscape fabric on walls and over the cloth.
- Skip: Non-breathable plastic sheeting against the walls — it traps moisture and speeds rot.
What the Liner Is For
A liner in a wooden bed has one main job on the walls — keeping soil away from the wood so the frame stays drier and lasts longer — and a different job on the bottom — stopping weeds and burrowing animals. The material that is perfect for one job can be terrible for the other, which is why “do you need a liner” has no single answer. Understanding the two jobs makes the choice obvious.
The Four Liner Options Compared
1. Woven landscape fabric (walls and bottom)
Woven polypropylene fabric — sold under established names like DeWitt — is the best all-round liner. It is breathable, so water and air pass through and the wood behind it can dry; it blocks weeds; and it holds soil in beds with slatted walls. Owners report it lasting 5–10 years in a bed. Use it on the interior walls, and across the bottom when pest pressure is low.
2. Hardware cloth (bottom)
Galvanized hardware cloth with 1/4-inch mesh is the only liner that genuinely stops gophers, voles, and moles — rodents chew straight through fabric. It does not hold fine soil by itself, so pair it with landscape fabric on top. Installed at build time, it is the cheapest insurance against a destroyed garden; retrofitting it later means emptying the bed. If burrowing pests are active in your area, consider this non-negotiable.
3. Plastic sheeting or pond liner (use sparingly)
Heavy plastic and EPDM pond liners are waterproof, which is precisely the problem in most gardens. Against wooden walls, they trap moisture between the plastic and the frame — the exact condition that rots wood fastest. On the bottom, they waterlog the soil and suffocate soil life. They are useful only for beds with no drainage access, and only with holes added. In every other case, skip them.
4. No liner at all
Going liner-free works, and many long-lived cedar beds were built that way. Untreated cedar naturally resists rot for years even in soil contact, and an open bottom gives unimpeded drainage and root access. The trade-off: the bottom boards will eventually need replacement, usually sooner than with a fabric liner, and weeds can grow up from the soil below. If you choose no liner, keep the bed off standing water and expect the frame to be the first part to wear out.
How to Install the Two-Layer System
- Staple 1/4-inch hardware cloth flat across the bed bottom, letting it overlap the frame walls by an inch.
- Cut woven landscape fabric to cover the walls plus the bottom, with a 2-inch overlap at the top rim.
- Staple the fabric along the top rim, smoothing it down the walls and over the hardware cloth.
- Overlap seams by 6 inches so soil cannot find a gap; trim excess at the corners.
- Fill with soil — the fabric presses against the walls naturally as the bed settles.
What Matters Most
- Breathability beats waterproofing. If it does not let air and water through, it does not belong in a food garden.
- The bottom layer is about pests, not rot. Match it to the animals in your neighborhood, not to fashion.
- Check the top edge each spring. The exposed rim of the fabric takes the most UV damage; re-staple any loose sections before they tear.
- A liner is not a substitute for good drainage. Set the bed on level, well-draining ground. Our soil structure guide covers why drainage is the foundation of healthy beds.
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FAQ
Will a liner make my wooden raised bed last longer?
Usually yes, if it is breathable. Keeping soil off the wood slows the moisture cycle that drives decay, and owners report fabric-lined beds outliving unlined ones by several seasons. Cedar already resists rot well; the liner stretches that lifespan further.
Is hardware cloth necessary for every wooden bed?
Only if you have burrowing pests — gophers, voles, or moles — in your area. If you have never seen signs of them, a fabric bottom or no bottom at all is fine. If you have lost plants to mysterious root-chewing, add hardware cloth when you next empty the bed.
Can I paint or seal the wood instead of lining it?
Yes, sealing is a complementary strategy: food-safe wood preservatives or linseed-based finishes slow rot. Sealing plus a breathable fabric liner is the longest-lived combination. Just avoid preservatives that are not labeled safe for food gardens.
How do I know if my liner is causing drainage problems?
Signs include standing water on the soil surface after rain, a sour smell, or roots rotting at the base of plants. If that happens, the liner is likely non-breathable or the bed has no drainage path. Replace it with landscape fabric and confirm the bed bottom is open.
Bottom Line
Line a wooden bed with breathable landscape fabric on the walls, add hardware cloth across the bottom if pests are a concern, and avoid plastic against the wood. It is a ten-minute job at build time that pays off in extra years of frame life and far fewer weeds. For the wider picture on keeping raised bed soil healthy season after season, see our soil health guide.
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