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If you’re like me, you’ve probably tried just about everything to keep weeds out of your garden. Those stubborn plants grow faster than anything else, crowding out the veggies and flowers I actually want to grow.
I’ve bought plenty of weed barrier fabric over the years, but it’s expensive and sometimes not very effective. Then I discovered something better—and totally free—cardboard.
In this article, I’ll show you exactly how cardboard can become your best gardening friend, blocking weeds for good without costing a cent.
Why Cardboard Beats Store-Bought Weed Barriers
I was skeptical at first, too. Could something as simple as cardboard really control weeds as well as store-bought barriers? Turns out, yes—and it has a few extra benefits, too:
- Blocks Sunlight Completely: Cardboard stops sunlight from reaching weed seeds beneath. Without sunlight, weeds just can’t grow. It’s simple science, and it really works.
- Helps Your Soil: Cardboard breaks down slowly, adding good organic matter to your soil. Earthworms love it, and healthier soil means healthier plants.
- It’s Totally Free: Instead of spending money on fabric barriers, you can use cardboard from boxes you already have. Ask your local grocery store or neighbors, and you’ll easily get enough for your whole garden.
- Eco-Friendly Option: Using cardboard helps reduce waste. Instead of throwing it away, you’re putting it to good use, helping your garden and the environment at the same time.
How to Use Cardboard as an Easy Weed Barrier
Setting up your cardboard weed barrier is easy and doesn’t take long at all. Here’s exactly what I do each season:
Step 1: Gather Enough Cardboard
Collect large pieces of cardboard, removing any tape or stickers first. Plain, unprinted cardboard is best, but boxes with a little ink are usually safe, too.
Step 2: Prepare Your Garden Area
First, mow or trim down any tall grass or weeds in your garden area. No need to pull weeds out; just flatten or cut them down. Cardboard will smother what’s left.
Step 3: Lay the Cardboard
Overlap the edges of your cardboard pieces so no sunlight sneaks through. Make sure to cover the whole garden area. The thicker the cardboard layer, the better your weed control will be.
Step 4: Wet the Cardboard
Water down the cardboard to help it stick to the ground and speed up decomposition. Wet cardboard also stays put better, even on windy days.
Step 5: Cover with Mulch or Soil
Spread a layer of mulch or compost on top of the cardboard. I usually use straw, grass clippings, or wood chips. This layer helps the cardboard stay damp, keeps your garden looking tidy, and adds extra nutrients.
Tips for the Best Results with Cardboard Weed Barriers
After using cardboard for weed control for several years, I’ve learned some handy tips to share:
- ✅ Thicker is Better: Use two or three layers if you have especially stubborn weeds. Thick cardboard layers stop even the toughest weeds from pushing through.
- ✅ Don’t Use Glossy or Waxed Cardboard: Regular brown cardboard works best. Glossy or wax-coated boxes don’t break down as easily and can leave residues in your soil.
- ✅ Check Regularly: Occasionally, check your cardboard barrier, especially after heavy rain. Add mulch or another cardboard piece if needed to keep weeds away.
Making your own weed barrier with cardboard is smart, easy, and completely free. I’ve saved money, reduced waste, and finally controlled weeds in my garden. Next time you’re frustrated by weeds, grab some cardboard, and give it a try—I promise, your garden (and wallet!) will thank you.
