Weeds can take over after just a few days of not weeding. I’ve discussed the many ways of getting rid of weeds naturally like natural weed killers before, but today I wanted to show you how to use a cardboard weed barrier to suppress the weeds.
Using Cardboard as a Weed Barrier (Tips)
Although there are obvious pros for using cardboard as weed barriers, but there are also some cons that you should learn about before using cardboard weed barriers.
Don’t use Colored Cardboard
Most colored cardboard will have toxic dyes that you don’t want in your soil; it’s better to use the most plain cardboard you can find. We’ve often used ones with writing on them simply because it’s hard to find plain ones, but steer clear of the fully colored ones.
Take the Tape off of the Cardboard Barrier
Can I be honest though here? I leave it on until it’s been raining enough times and then rip it off… I’ve found it’s easier to come off that way. You do end up with bits of tape underneath, but I’ve found it easy to remove later in the season. Much easier than taking it off from dry cardboard. But really, yes you want to remove all the tape first, it’s something else you don’t want in your soil.
Place Rocks or Mulch on Your Cardboard Barrier
One gusty wind and your cardboard will blow away, especially if you’re using smaller pieces. We overlap them and add heavy rocks on them before we add the mulch.
How Long Will a Cardboard Weed Barrier Last?
The cardboard will get slippery and mushy over time so it’s a short-term solution
Even though cardboard can hide the weeds instantly and block out the light to your weeds, it will decompose within a couple of months (you’ll see an accumulation of worms underneath as they love it!). Cardboard is great to use if you’re building a lasagna garden bed (you can see the process of one of ours below) but you’ll still need some mulch over top of it eventually. Be wary after many rainfalls it can be a little slippery too!
Should You Use a Cardboard Weed Barrier?
Cardboard can be a great quick fix for weed control in your garden and is perfect for lasagna gardening or putting at the base of new raised beds. It won’t give you permanent weed control however so you’ll need to come up with something for the long-term like adding mulch on top of the cardboard.