Landscape fabric costs $50+ per roll and creates waste when replaced. Cardboard is free, works better, and improves your soil.
The Story
Most people break down Amazon boxes and toss them in recycling. I used to do the same. Then I started gardening seriously and realized I was paying $50-100 for landscape fabric while throwing away free weed barrier every week.
I tried cardboard in my flower beds in 2023. Flattened boxes, laid them over bare soil, overlapped the edges, covered with mulch. The weeds disappeared. The cardboard broke down slowly, fed the soil, and cost me nothing. I’ve been doing it ever since.
Here’s what convinced me: Landscape fabric suppresses weeds for a few years, then you have to remove it—and removal is a nightmare. Cardboard suppresses weeds just as well, breaks down into organic matter, and actually improves soil quality as it decomposes. When it’s gone, it’s truly gone—no pulling plastic mesh out of your garden beds.
How I Use Cardboard as Weed Barrier
Step 1: Prep the Cardboard
Save boxes from deliveries. Remove tape and address stickers (they don’t decompose). Flatten completely.
Step 2: Lay Down the Cardboard
- Cover the entire bed area
- Overlap edges by 6-8 inches (prevents weeds from sneaking through gaps)
- For transplants: cut X-shaped slits, plant through the cardboard
Step 3: Cover It
Cover with 2-4 inches of mulch. Holds cardboard in place, adds another layer of weed suppression, looks finished.
The Win-Win
Cost comparison:
- Landscape fabric: $50-100+ per roll
- Cardboard boxes: $0 (already arriving at your house)
Performance comparison:
- Landscape fabric: Lasts 3-5 years, doesn’t decompose, nightmare to remove
- Cardboard: Lasts 1-2 summers, decomposes completely, improves soil structure
Both suppress weeds effectively. Cardboard requires replacement more often—but it’s free, improves your soil, and creates zero plastic waste.
What NOT to Do
- Don’t leave tape and stickers on. They don’t decompose.
- Don’t use glossy or waxed cardboard. Stick to standard brown shipping boxes.
- Don’t skip the overlap. Weeds will find any gap.
Cardboard isn’t fancy. It’s just flattened boxes. But free weed control that improves your soil instead of creating plastic waste? That’s worth saving.